'Happy Days' star Erin Moran may have died from complications from cancer, sheriff says

"Happy Days" star Erin Moran may have been fighting stage 4 cancer according to new evidence from the Harrison County Sheriff's Office.

Moran, 56, was found dead at her New Salisbury, Indiana, residence on Saturday and fans were shocked to hear of her untimely passing.

The Harrison County Sheriff's Office said Monday a "joint investigation into Mrs. Moran's death was conducted" and "a subsequent autopsy revealed that Mrs. Moran likely succumbed to complications of stage 4 cancer."

TMZ broke the news on Saturday that Moran was found unresponsive at her home. Rumors initially swirled that Moran, who had many ups and downs following her time on "Happy Days," may have been struggling with substance abuse, but the claims reportedly are unfounded.

More details developing.

PHOTOS: A look back at Erin Moran's life

24 PHOTOS
Erin Moran through the years
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Erin Moran through the years
Actress Erin Moran poses for a portrait in circa 1980. (Photo by Michael Ochs Archives/Getty Images)
American actors Erin Moran and Scott Baio hold each other in a publicity still for the television show 'Joanie Loves Chachi,' in which they play the title characters, 1982. (Photo by Fotos International/Getty Images)
BEVERLY HILLS, CA - JANUARY 30: Actor Scott Baio and Actress Erin Moran attending 39th Annual Golden Globe Awards on January 30, 1982 at Beverly Hilton Hotel in Beverly Hills, California. (Photo by Betty Galella/WireImage)
BEVERLY HILLS, CA - JANUARY 30: Actor Scott Baio and actress Erin Moran attend the 39th Annual Golden Globe Awards on January 30, 1982 at the Beverly Hilton Hotel in Beverly Hills, California. (Photo by Betty Galella/WireImage)
NEW YORK - OCTOBER 25: Actress Erin Moran and Scott Baio attending 1982 American Image Awards on October 25, 1982 at Sheraton Center in New York City, New York. (Photo by Ron Galella/WireImage)
American actors Erin Moran, wearing a wedding dress, and Scott Baio, wearing a tuxedo, pose at an altar in a promotional portrait from the TV program 'Happy Days.' Their characters Joanie and Chachi were married during the show's final season. (Photo by Hulton Archive/Getty Images)
Actress Erin Moran attends 17th Annual Academy of Country Music Awards on April 29, 1982 at Knott's Berry Farm in Buena Park, California. (Photo by Ron Galella/WireImage)
LOS ANGELES - JUNE 7: Actress Pat Klous and actress Erin Moran attend K-Earth 101.1 FM Radio Station Celebrity Charity Basketball Game on June 7, 1986 at Fairfax High School in Los Angeles, California. (Photo by Ron Galella, Ltd./WireImage)
Actress Erin Moran attends the premiere of The Evening Star on December 13, 1996 at Mann National Theater in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
Actress Erin Moran and Steve Fleischman attend Ringling Brothers Circus Variety Club Children's Benefit on August 7, 1997 at the Great Western Forum in Inglewood, California. (Photo by Ron Galella, Ltd./WireImage)
Actress Erin Moran attends American Image Awards on October 25, 1982 at the Sheraton Center in New York City. (Photo by Ron Galella/WireImage)
Actress Erin Moran attends Benefit Basketball Game on June 7, 1986 at the Fairfax High School in Los Angeles, California. (Photo by Ron Galella, Ltd./WireImage)
Actress Erin Moran attends Third Annual Connie Stevens Celebrity Fashion Show on June 8, 1986 at the Ambassador Hotel in New York City. (Photo by Ron Galella, Ltd./WireImage)
391064 10: Actress Erin Moran attends the Hollywood Collectors & Celebrities Show June 23, 2001 at Beverly Garland''s Holiday Inn in North Hollywood, CA. (Photo by Getty Images)
LOS ANGELES, CA - MARCH 14: Actress Erin Moran attends a launch party for DeeDee Bigelow's episode on Surreal Life at Mood supperclub on March 14, 2007 in Los Angeles, California. (Photo by Chad Buchanan/Getty Images)
Actress Erin Moran attends Night of 100 Stars Gala on November 2, 1983 at the Bel Air Hotel in Los Angeles, California. (Photo by Ron Galella, Ltd./WireImage)
NORTH HOLLYWOOD, CA - MAY 6: (L-R) Actresses Erin Moran, Marion Ross, Cloris Leachman and Holland Taylor attend 'A Mother's Day Salute to TV Moms' at the Academy of Television Arts & Sciences May 6, 2008 in North Hollywood, California. (Photo by David Livingston/Getty Images)
NORTH HOLLYWOOD, CA - MAY 6: Actress Erin Moran (R) and her husband Steven Fleischmann attend 'A Mother's Day Salute to TV Moms' at the Academy of Television Arts & Sciences May 6, 2008 in North Hollywood, California. (Photo by David Livingston/Getty Images)
NORTH HOLLYWOOD, CA - MAY 6: Actress Erin Moran attends 'A Mother's Day Salute to TV Moms' at the Academy of Television Arts & Sciences May 6, 2008 in North Hollywood, California. (Photo by David Livingston/Getty Images)
HOLLYWOOD - SEPTEMBER 24: Actress Erin Moran arrives at the Fox Reality Channel Really Awards at the Avalon Hollywood club September 24, 2008 in Hollywood California. (Photo by Frazer Harrison/Getty Images)
HOLLYWOOD, CA - SEPTEMBER 24: Actress Erin Moran and guest attend the FOX Reality Channel Really Awards on September 24, 2008 at the Avalon Hollywood club in Hollywood, California. (Photo by Getty Images for FOX)
LOS ANGELES, CA - APRIL 23: Actress Erin Moran at the 4th Annual LA Jewish Film Festival Opening Night Gala Event at the Writer's Guild Theater on April 23, 2009 in Beverly Hills, California. (Photo by Amy Graves/WireImage)
NORTH HOLLYWOOD, CA - JUNE 18: Actress Erin Moran arrives at the Academy Of Television Arts & Sciences' 'Father's Day Salute To TV Dads' on June 18, 2009 in North Hollywood, California. (Photo by Frazer Harrison/Getty Images)
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