Barbara Corcoran shares brother had an existing heart condition prior to his death in Dominican Republic

Barbara Corcoran is speaking out about the recent death of her brother, John.

Corcoran's rep told ET on Wednesday that John died in late April in the Dominican Republic of what is believed to be natural causes. Still, the news was alarming given the recent reports of multiple American tourists' deaths while they were vacationing at resorts in Punta Cana.

But Corcoran took to Instagram on Thursday to share that her brother actually had an existing heart condition, and she also gave her condolences to the families of the tourists who have recently died in the Dominican Republic.

"It's made it to the news by now that my dear brother John passed away in the Dominican Republic back in April," the 70-year-old Shark Tank star wrote. "He loved the DR and vacationed there frequently."

"My brother had an existing heart condition and we believe he died of natural causes, but you're still never ready for the death of a loved one," she continued. "I'm overwhelmed with sadness for the lost lives in the DR and my thoughts are with the families who have lost their loved ones. Thank you for all of your thoughts and good wishes. I appreciate your love and kindness."

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Corcoran previously told TMZ that 60-year-old John was found dead in his hotel room by his friend he was vacationing with, and that she was told he died of a heart attack. John -- who was one of Corcoran's nine siblings -- was retired after owning and operating a successful roofing company in New Jersey. According to the outlet, he was waiting on the arrival of his girlfriend in the Dominican Republic before he died.

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GOOD MORNING AMERICA - Barbara Corcoran of ABC's 'Shark Tank' is a guest on 'Good Morning America,' Tuesday, November 28, 2017, airing on the ABC Television Network. (Photo by Heidi Gutman/ABC via Getty Images) BARBARA CORCORAN
LOS ANGELES, CA - NOVEMBER 21: Real estate mogul and 'Shark Tank' panelist Barbara Corcoran poses at 'Dancing with the Stars' season 25 finale at The Grove on November 21, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
NEW YORK, NY - NOVEMBER 08: (EXCLUSIVE COVERAGE) TV personality Barbara Corcoran visits 'The Elvis Duran Z100 Morning Show' at Z100 Studio on November 8, 2017 in New York City. (Photo by Slaven Vlasic/Getty Images)
BEVERLY HILLS, CA - SEPTEMBER 20: Businesswoman Barbara Corcoran attends the premiere of ABC's 'Shark Tank' Season 9 at The Paley Center for Media on September 20, 2017 in Beverly Hills, California. (Photo by Rodin Eckenroth/FilmMagic)
LOS ANGELES, CA - SEPTEMBER 25: Real estate mogul and 'Shark Tank' panelist Barbara Corcoran attends 'Dancing with the Stars' season 25 at CBS Televison City on September 25, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
BEVERLY HILLS, CA - SEPTEMBER 20: Barbara Corcoran attends the premiere of ABC's 'Shark Tank' Season 9 at The Paley Center for Media on September 20, 2017 in Beverly Hills, California. (Photo by Araya Diaz/WireImage)
LOS ANGELES, CA - SEPTEMBER 18: Real estate mogul and 'Shark Tank' panelist Barbara Corcoran attends 'Dancing with the Stars' season 25 at CBS Televison City on September 18, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
NEW YORK, NY - JULY 15: Barbara Corcoran partnered with T.J.Maxx to host The Maxx You Project Workshop, encouraging women pursuing their dreams to let their individuality shine, on Saturday, July 15, 2017 in New York City. (Photo by Ilya S. Savenok/Getty Images for T.J. Maxx)
NEW YORK, NY - MAY 17: (EXCLUSIVE COVERAGE) Author/TV personality Barbara Corcoran visits 'The Elvis Duran Z100 Morning Show' at Z100 Studio on May 17, 2017 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - APRIL 26: Barbara Corcoran attends the Housing Works Ground Breaker Awards Dinner at Metropolitan Pavilion on April 26, 2017 in New York City. (Photo by Mike Pont/WireImage)
NEW YORK, NY - APRIL 26: Barbara Corcoran attends Housing Works' Groundbreaker Awards Dinner 2017 at Metropolitan Pavilion on April 26, 2017 in New York City. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)
NEW YORK, NY - APRIL 13: (EXCLUSIVE COVERAGE) Businesswoman/TV personality Barbara Corcoran visits SiriusXM Studios on April 13, 2017 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - FEBRUARY 08: TV personality Barbara Corcoran attends the Build series to Discuss 'Shark Tank' at Build Studio on February 8, 2017 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - NOVEMBER 10: TV personality Barbara Corcoran attends the 'Fantastic Beasts And Where To Find Them' world premiere at Alice Tully Hall, Lincoln Center on November 10, 2016 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - SEPTEMBER 28: Barbara Corcoran attends The Paley Center for Media Presents Shark Tank: Pursuing the American Dream in Prime Time at The Paley Center for Media on September 28, 2016 in New York City. (Photo by Michael Stewart/WireImage)
BEVERLY HILLS, CA - SEPTEMBER 23: Barbara Corcoran attends the 'Shark Tank' season 8 premiere at Viceroy L'Ermitage Beverly Hills on September 23, 2016 in Beverly Hills, California. (Photo by Tibrina Hobson/Getty Images)
SHARK TANK - 'Episode 901' - Chris Gronkowski from Colleyville, Texas, his brother Rob Gronkowski from the New England Patriots, and the rest of the Gronk brothers bring an insulated sports bottle to the Tank. Mark Cuban and Alex Rodriguez offer sage advice to a 17-year-old from St. Louis, Missouri, who devised a tool to quickly soothe foot pain; an entrepreneur from Phoenix, Arizona, with a nutrition and culinary background, has a sweeter way to eat a popular snack; and a man from Los Angeles, California, hopes to lock up a deal with his innovative way to keep belongings safe, on 'Shark Tank,' airing SUNDAY, OCTOBER 15 (9:00-10:00 p.m. EDT), on The ABC Television Network. (Michael Desmond/ABC via Getty Images) BARBARA CORCORAN
SHARK TANK - 'Episode 801'- 'Shark Tank,' the critically acclaimed and Emmy Award-winning reality show that revolutionized entrepreneurship in America, is back for an eighth season with the Sharks continuing the search to invest in the best businesses and products that America has to offer. In the season premiere and for the first time, the feeding frenzy begins with six Sharks instead of the usual five circling the Tank, airing FRIDAY, SEPTEMBER 23 (9:00-10:01 p.m. EDT), on the ABC Television Network. (Michael Desmond/ABC) DAYMOND JOHN, BARBARA CORCORAN, KEVIN O'LEARY, LORI GREINER
NEW YORK, NY - MAY 12: Barbara Corcoran appears to discuss 'Shark Tank' during the AOL BUILD Speaker Series at AOL Studios In New York on May 12, 2016 in New York City. (Photo by Donna Ward/Getty Images)
NEW YORK, NY - MAY 17: Barbara Corcoran attends Robert Herjavec In Conversation With Barbara Corcoran at 92nd Street Y on May 17, 2016 in New York City. (Photo by Steven A Henry/Getty Images)
NEW YORK, NY - MAY 12: Businesswoman and Investor Barbara Corcoran attends 'Shark Tank' and 'Beyond the Tank' at AOL Studios In New York on May 12, 2016 in New York City. (Photo by Adela Loconte/WireImage)
BEYOND THE TANK - 'Episode 206' - Barbara Corcoran's very first deal in the Tank helped Washington D.C.'s Heath Hall and Brett Thompson grow Pork Barrel BBQ spice rub into a national brand. But barbeque is a seasonal industry, so the two successful entrepreneurs created a new product that could be a culinary hit, but they must first get government approval, on 'Beyond the Tank,' airing FRIDAY, MAY 20 (8:00-9:00 p.m. EDT), on the ABC Television Network. (Photo by Donald Rager/ABC via Getty Images) BARBARA CORCORAN
LOUISVILLE, KY - MAY 02: Barbara Corcoran attends the 141st Kentucky Derby at Churchill Downs on May 2, 2015 in Louisville, Kentucky. (Photo by Tasos Katopodis/Getty Images for Churchill Downs)
BEYOND THE TANK - 'Episode 103' - One of the youngest entrepreneurs to get a deal in the Tank was then 11-year old Ryan Kelly from Stamford, CT in Season 4 with shark Barbara Corcoran for the dog treat business now called Ryan's Ruffery. While the company experiences healthy growth, young Ryan focuses on his schooling and his mother, Daniela, takes care of all the business's needs, despite having suffered two strokes. An understandably concerned Barbara meets with Ryan and Daniela to strategize how to keep the business on track, on 'Beyond the Tank,' FRIDAY, MAY 15 (9:00-10:01 p.m., ET) on the ABC Television Network. (Photo by Giovanni Rufino/ABC via Getty Images)
BEYOND THE TANK - 'Episode 107' - During Season Four, Barbara Corcoran invested in Cousins Maine Lobster, a food truck company providing fresh Maine lobster rolls to the Los Angeles area. Founders Jim Tselikis and Sabin Lomac from West Hollywood, CA hope to expand into a brick-and-mortar space, but Barbara has her reasons for wanting to hold off on that idea. 'Beyond the Tank' airs THURSDAY, JANUARY 21 (8:00-9:00 p.m. EST) on the ABC Television Network. (Photo by Gilles Mingasson/ABC via Getty Images) BARBARA CORCORAN
BEYOND THE TANK - 'Episode 110' - Barbara Corcoran invested in The Coop from Los Angeles-based Juliet Boydstun & Lucinda Lent during Season Four. She was surprised to discover that the two longtime friends and moms were not making any money or expanding and gives them a perfect plan to grow The Coop, a kid's indoor/outdoor play and party space. The season premiere airs TUESDAY, SEPTEMBER 29 (10:00-11:00 p.m., ET) on the ABC Television Network. (Photo by John Fleenor/ABC via Getty Images)
NEW YORK, NY - APRIL 25: Barbara Corcoran speaks on stage at NAPW 2014 Conference - Day 2 on April 25, 2014 in New York City. (Photo by Brian Ach/Getty Images for National Association of Professional Women)
SHARK TANK - 'Episode 513' - A former pro football player from Avon, Ohio tries to sell the Sharks on his delicious boneless baby back ribs which can be cooked in 2 minutes in the microwave-but will a strong pitch and tasty food be enough for the Sharks to bite? Two moms from Bayonne, New Jersey have a line of detachable mohawks to dress up kids' safety helmets and entrepreneurs from Los Angeles sell whimsical animal themed hat/scarf combinations on 'Shark Tank.' Houston entrepreneur has a first-of-its-kind reality interface for video gamers, allowing users to be completely immersed in their game experience--and Shark Robert Herjavec can't wait to try it out. Plus, Sharks Mark Cuban and Daymond John travel to Washington, D.C. to be panelists at the Kingonomics Entrepreneurship and Investment Conference, an event for minority-owned businesses which also includes a casting call, on 'Shark Tank,' FRIDAY, DECEMBER 6 (9:00-10:01 p.m., ET) on the ABC Television Network. (Photo by Michael Ansell/ABC via Getty Images) BARBARA CORCORAN, ROBERT HERJAVIC
CORPORATE - May 14, 2013 - ABC talent, executives and executive producers attended the 2013 Entertainment Weekly After Party during upfront week at The General in New York City. (Photo by Lorenzo Bevilaqua/ABC via Getty Images) DAYMOND JOHN, BARBARA CORCORAN, KEVIN O'LEARY
SHARK TANK - Barbara Corcoran is a 'Shark' on ABC's 'Shark Tank.' (Photo by Richard Cartwright/ABC via Getty Images)
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