Lamar Odom suffered heart attack, source says; Kardashian-Jenner family 'praying for a miracle'

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EXCLUSIVE: Lamar Odom Had Heart Attack, Placed in Medically Induced Coma

ET is hearing that Lamar Odom suffered a heart attack on Tuesday night and was placed into a medically induced coma.

A source close to Odom tells ET that the former NBA pro has suffered some organ failure after he was found unresponsive at the Love Ranch brothel in Crystal, Nevada. While his condition has improved, our source says "it is still dire."

READ MORE: Khloe Kardashian still not legally divorced from Lamar Odom

ET can confirm that Kourtney Kardashian's ex-boyfriend, Scott Disick, has arrived at Sunrise Hospital in Las Vegas, Nevada, where Odom is in critical condition. The former NBA pro's father, Joe, also arrived at the hospital, and Odom's two children are expected later today. Odom's ex, Khloe Kardashian, has been by his side since first arriving on Tuesday night. Her sister, Kim, and mother, Kris Jenner, are there as well.

Click through to see more of Odom through the years:

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Lamar Odom through the years
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Lamar Odom suffered heart attack, source says; Kardashian-Jenner family 'praying for a miracle'
CLEVELAND, OH - MARCH 1: A close up shot of Lamar Odom #7 of the Los Angeles Clippers during the game against the Cleveland Cavaliers at The Quicken Loans Arena on March 1, 2013 in Cleveland, Ohio. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. Mandatory Copyright Notice: Copyright 2013 NBAE (Photo by David Liam Kyle/NBAE via Getty Images)
5 Dec 1998: Lamar Odom #5 of the Rhode Island Rams dribbles during a game against the California Golden Bears at the Oakland Coliseum in Oakland, California. Cal defeated Rhode Island 71-64.
8 Mar 2000: Lamar Odom #7 of the Los Angeles Clippers looks up as he waits on the court during a game against the Toronto Raptors at the Staples Center in Los Angeles, California. The Raptors defeated the Clippers 95-94. Mandatory Credit: Robert Laberge /Allsport
5 Jan 2001: Lamar Odom #7 of the Los Angeles Clippers lays in pains by the Hormets bench during the game against the Charlette Hornets at the STAPLES Center in Los Angeles, California. The Hornets defeated the Clippers 86-73. NOTE TO USER: It is expressly understood that the only rights Allsport are offering to license in this Photograph are one-time, non-exclusive editorial rights. No advertising or commercial uses of any kind may be made of Allsport photos. User acknowledges that it is aware that Allsport is an editorial sports agency and that NO RELEASES OF ANY TYPE ARE OBTAINED from the subjects contained in the photographs.Mandatory Credit: Donald Miralle /Allsport
LOS ANGELES - DECEMBER 28: Lamar Odom #7 of the Los Angeles Clippers drives past Antawm Jamison #33 of the Golden State Warriors during the game at Staples Center on December 28, 2002 in Los Angeles, California. The Warriors won 99-92. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Lisa Blumenfeld/Getty Images)
5 Nov 2000: Lamar Odom #7 of the Los Angeles Clippers looks on during the game against the Los Angeles Lakers at the Staples Center in Los Angeles, California. The Lakers defeated the Clippers 108-103. NOTE TO USER: It is expressly understood that the only rights Allsport are offering to license in this Photograph are one-time, non-exclusive editorial rights. No advertising or commercial uses of any kind may be made of Allsport photos. User acknowledges that it is aware that Allsport is an editorial sports agency and that NO RELEASES OF ANY TYPE ARE OBTAINED from the subjects contained in the photographs.Mandatory Credit: Jeff Gross /Allsport
MIAMI - MAY 18: Lamar Odom #7 of the Miami Heat congratulates Ron Artest #23 of the Indiana Pacers with a hug following game 6 of the Eastern Conference Semifinals during the 2004 NBA Playoffs May 18, 2004 at the American Airlines Arena in Miami, Florida. The Pacers won 73-70 to advance to the Eastern Conference Finals. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Doug Pensinger/Getty Images)
MIAMI - MAY 4: Lamar Odom #7 of the Miami Heat towels off with a smile on his face after beating the New Orleans Hornets during Game seven of the Eastern Conference Quarterfinals during the 2004 NBA Playoffs May 4, 2004 at the American Airlines Arena in Miami, Florida. The Heat beat the Hornets 85-77 and advance to the Semifinals against the Indiana Pacers. (Photo by Eliot J. Schechter/Getty Images)
ATHENS - AUGUST 15: Lamar Odom #14 (L) and Stephon Marbury #5 of the United States watch from the bench in the final moments of their loss to Puerto Rico in the men's basketball preliminary game on August 15, 2004 during the Athens 2004 Summer Olympic Games at the Indoor Arena of the Helliniko Olympic Complex in Athens, Greece. Puerto Rico defeated USA 92-73. (Photo by Andy Lyons/Getty Images)
LOS ANGELES - DECEMBER 25: Lamar Odom #7 of the Los Angeles Lakers claps on the court in the fourth quarter against the Miami Heat on December 25, 2004 at Staples Center in Los Angeles, California. The Heat defeated the Lakers in overtime 104-102. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Lisa Blumenfeld/Getty Images)
LOS ANGELES - JANUARY 13: Lamar Odom #7 of the Los Angeles Lakers drives against Anderson Varejao #17 of the Cleveland Cavaliers on January 13, 2005 at Staples Center in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Jeff Gross/Getty Images)
NEW YORK - FEBRUARY 28: Lamar Odom #7 of the Los Angeles Lakers dribbles the ball up court against the New York Knicks during their game on February 28, 2005 at Madison Square Garden in New York City. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Jim McIsaac/Getty Images)
LOS ANGELES - NOVEMBER 18: Lamar Odom #7 and Kobe Bryant #8 of the Los Angeles Lakers celebrate during the game with the Los Angeles Clippers on November 18, 2005 at Staples Center in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Lisa Blumenfeld/Getty Images)
LOS ANGELES - OCTOBER 31: Lamar Odom #7 of the Los Angeles Lakers drives to the basket against the Phoenix Suns on October 31, 2006 at Staples Center in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Jeff Gross/Getty Images)
LOS ANGELES - APRIL 3: Lamar Odom #7 of the Los Angeles Lakers looks on from the bench in the final minutes against the Denver Nuggets at Staples Center April 3, 2007 in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Lisa Blumenfeld/Getty Images)
LOS ANGELES, CALIFORNIA - SEPTEMBER 16: Lamar Odom of the Los Angeles Lakers attends The HBO Emmy after party at the Pacific Design Center on September 16, 2007 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)
LOS ANGELES - MARCH 30: Kobe Bryant #24 of the Los Angeles Lakers chest bumps Lamar Odom #7 during the game against the Houston Rockets at Staples Center on March 30, 2007 in Los Angeles, California. The Rockets won 107-104. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Lisa Blumenfeld/Getty Images)
LOS ANGELES - MARCH 26: Lamar Odom #7 of the Los Angeles Lakers drives the ball upcourt during the game against the Charlotte Bobcats on March 26, 2008 at Staples Center in Los Angeles, California. The Bobcats won 108-95. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Jeff Gross/Getty Images)
LOS ANGELES, CA - NOVEMBER 18: Lamar Odom #7 (L) and Kobe Bryant #24 of the Los Angeles Lakers have a playful moment on the bench after Odom fouled out of the game with the Chicago Bulls at Staples Center November 18, 2008 in Los Angeles, California. The Lakers won 116-109. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Stephen Dunn/Getty Images)
CULVER CITY, CA - OCTOBER 14: NBA player Lamar Odom poses in the front row at the Lana Fuchs Spring 2009 fashion show during Mercedes-Benz Fashion Week held at Smashbox Studios on October 14, 2008 in Culver City, California. (Photo by Michael Buckner/Getty Images for IMG)
LOS ANGELES, CA - DECEMBER 12: Lamar Odom #7 (R) and Derek Fisher #2 of the Los Angeles Lakers take a breather after a stoppage in play late in the game against the Sacramento Kings on December 12, 2008 at Staples Center in Los Angeles, California. The Lakers won 112-103. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Stephen Dunn/Getty Images)
BEVERLY HILLS, CA - FEBRUARY 08: Professional basketball player Lamar Odom attends Russell Simmons' 'Salute to Grammy Award Nominees' celebration at a private mansion on February 8, 2009 in Beverly Hills, California. (Photo by David Livingston/Getty Images)
DENVER - MAY 23: Lamar Odom #7 of the Los Angeles Lakers looks on while taking on the Denver Nuggets in Game Three of the Western Conference Finals during the 2009 NBA Playoffs at Pepsi Center on May 23, 2009 in Denver, Colorado. (Photo by Doug Pensinger/Getty Images)
LOS ANGELES, CA - JUNE 07: Lamar Odom #7 of the Los Angeles Lakers answers questions during the post game news conference after defeating the Orlando Magic 101-96 in Game Two of the 2009 NBA Finals at Staples Center on June 7, 2009 in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Jeff Golden/Getty Images)
LOS ANGELES, CA - SEPTEMBER 22: NBA player Lamar Odom and TV personality Khloe Kardashian arrive to NSF & GQ Magazine's Stop Puppy Mills Humane Society benefit at a private estate on September 22, 2009 in Los Angeles, California. (Photo by Angela Weiss/Getty Images)
EL SEGUNDO, CA - SEPTEMBER 29: Lamar Odom #7 (C) of the Los Angeles Lakers is surrounded by a crush of reporters during Lakers media day at the Lakers training facility on September 29, 2009 in El Segundo, California. Odom married Khloe Kardashian over the weekend. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Kevork Djansezian/Getty Images)
LOS ANGELES, CA - OCTOBER 21: Lamar Odom of the Los Angeles Lakers and wife Khole Kardashian arrive at the Lamar Odom Launches Rich Soil At Kitson LA event on October 21, 2009 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
ORLANDO, FL - JUNE 14: Lamar Odom #7 of the Los Angeles Lakers looks at the Wheaties box during the post game news conference after the Lakers defeated the Orlando Magic 99-86 to win the NBA Championship in Game Five of the 2009 NBA Finals on June 14, 2009 at Amway Arena in Orlando, Florida. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Chris Graythen/Getty Images)
PHOENIX - MAY 23: Lamar Odom #7 of the Phoenix Suns during Game Three of the Western Conference finals of the 2010 NBA Playoffs against the Los Angeles Lakers at US Airways Center on May 23, 2010 in Phoenix, Arizona. The Suns defeated the Lakers 118-109. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Christian Petersen/Getty Images)
LAS VEGAS - JULY 21: In this handout photo provided by Las Vegas News Bureau, Lamar Odom of Team USA stretches before a Men�s National Team workout at the Cox Pavilion July 21, 2010 in Las Vegas Nevada. (Photo by Brian Jones/Las Vegas News Bureau via Getty Images)
MADRID, SPAIN - AUGUST 22: Lamar Odom of the USA concentrates on a free throw during a friendly basketball game between Spain and the USA at La Caja Magica on August 22, 2010 in Madrid, Spain. (Photo by Jasper Juinen/Getty Images)
NEW YORK - AUGUST 02: Lamar Odom and Khloe Kardashian attends the Casio 'Shock the World' event at The Manhattan Center on August 2, 2010 in New York City. (Photo by Jason Kempin/Getty Images)
HOLLYWOOD - SEPTEMBER 21: Television personality Khloe Kardashian (L) and Los Angeles Laker Lamar Odom attend the 'AXE Music One Night Only' concert series featuring Weezer at Dunes Inn Motel - Sunset on September 21, 2010 in Hollywood, California. (Photo by Michael Buckner/Getty Images For AXE)
LOS ANGELES, CA - MARCH 20: Lamar Odom #7 of the Los Angeles Lakers reacts as his team is called for a foul during the game against the Portland Trail Blazers at the Staples Center on March 20, 2011 in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Harry How/Getty Images)
LOS ANGELES, CA - JULY 11: US Olympic Gold Medalist Bruce Jenner (L) and NBA player Lamar Odom of the Los Angeles Clippers arrive at the 2012 ESPY Awards at Nokia Theatre L.A. Live on July 11, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
PHOENIX, AZ - JANUARY 24: Lamar Odom #7 of the Los Angeles Clippers during the NBA game against the Phoenix Suns at US Airways Center on January 24, 2013 in Phoenix, Arizona. The Suns defeated the Clippers 93-88. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Christian Petersen/Getty Images)
LOS ANGELES, CA - APRIL 1: Tyler Hansbrough #50 of the Indiana Pacers battles for rebound position against Lamar Odom #7 of the Los Angeles Clippers at Staples Center on April 1, 2013 in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. Mandatory Copyright Notice: Copyright 2013 NBAE (Photo by Andrew D. Bernstein/NBAE via Getty Images)
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EXCLUSIVE: Kardashian-Jenner Family 'Still Loves' Lamar Odom, Source Says, He 'Just Has Very Bad Demons'

The Kardashian-Jenner family are "praying for a miracle to happen."

"They are devastated. They have tried so hard to help Lamar with his issues and it breaks their hearts that he could lose this battle," a source close to the family told ET. "The entire family is pulling for Lamar to make it through this."

As for the Keeping Up With the Kardashians cameras, ET confirms that the reality show is not rolling while the family is at Sunrise.

SEE MORE: Lamar Odom's grandmother Florence Odom speaks out: 'I heard he's very sick'

Meanwhile, entertainment reporter Ken Baker says Odom's doctors are treating the 35-year-old athlete's health condition as a drug overdose. When speaking to E! News, Baker said a source inside the hospital told him that "drugs were found in [Odom's] system," including opiates.

Baker's source reportedly added that doctors think Odom suffered from an ischemic stroke, where blood circulation is cut off from the brain. This condition can occur with excessive cocaine and/or crack cocaine use, but this has not been confirmed to be the case for Odom.

MORE: Khloe Kardashian at Lamar Odom's Bedside as Family Gathers at Las Vegas Hospital

"So, likely there's brain damage, but they're not sure how much," Baker's source reportedly said. "Virtually every drug imaginable was found in his system."

MORE: Lamar Odom's Friends and Former Teammates Offer Prayers and Support: 'He's a Fighter'

When ET spoke with brothel owner Dennis Hof, he did not think drugs were at play. "The police looked through his things and they didn't tell us they found anything," Hof said. "The girls that were hanging out with him didn't see any use of any illegal drugs at all."

See more images of Odom and Kardashian:

A source at the brothel where Odom was found also revealed to ET that he was staying in the establishment's High Roller Suite, which is considered Hof's private lair. The stated price for this suite starts at $10,000 a night.

EXCLUSIVE: Lamar Odom Struggled in Las Vegas, Was 'Pretty Much Broke,' Source Says

ET was told that Odom made a reservation at the Love Ranch. A car service was arranged to pick him up, and he was at the brothel for four days.

"He looked terrible," Hof told ET of Odom's appearance. "He looked like a guy who was really sick and needed to be rushed to an ER immediately."

WATCH: Brothel Owner Dennis Hof on Lamar Odom: 'He Was in Bad Shape':

EXCLUSIVE: Brothel Owner Dennis Hof on Lamar Odom: 'He Was in Bad Shape'
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