UPDATE 12;30 PM 4/24/17: Erin Moran, likely died of throat cancer, according to the Harrison County Sheriff's Office and the county coroner.
The statement did not say what kind of cancer Moran had.
Erin Moran, best known for playing Joanie Cunningham on the 1970s sitcom, Happy Days, is dead at age 56.
According to NPR, The Harrison County Sheriff's Department says Moran was found unresponsive after Indiana authorities received a 911 call Saturday afternoon. In a short press release, the Department did not give a presumed cause of death, but said an autopsy is pending.
Born in Burbank, Calif., Moran shot to fame in 1974 after she was cast as the younger sister to Ron Howard's character, Richie Cunningham, in Happy Days.
The former child star reprised that role in 1982 for the short-lived spinoff Joanie Loves Chachi alongside Scott Baio before returning to Happy Days for its final season in 1983 and 1984.
Moran later landed guest appearances on TV shows including The Love Boat, Murder, She Wrote and The Bold and the Beautiful. More recently, she competed on the VH1 reality show Celebrity Fit Club and appeared in the low-budget 2010 film Not Another B Movie.
In 2012, Moran was among the handful of Happy Days actors who won $65,000 each in a settled lawsuit against CBS over unpaid royalties.
That same year, Moran had been the subject of tabloid reports of hard-partying, financial troubles and periods of homelessness, with husband Steven Fleischmann, after being kicked out of her mother-in-law's Corydon, Ind., trailer home.
Such sad sad news. RIP Erin. I'll always choose to remember you on our show making scenes better, getting laughs and lighting up tv screens. https://t.co/8HmdL0JKlf— Ron Howard (@RealRonHoward) April 23, 2017
OH Erin... now you will finally have the peace you wanted so badly here on earth ...Rest In It serenely now.. too soon— Henry Winkler (@hwinkler4real) April 23, 2017
Don Most, who starred alongside Moran as the jokester Ralph Malph on Happy Days, said in a statement, “I am so incredibly sad to hear about Erin. She was a wonderful, sweet, caring, talented woman. As I write this I can’t really comprehend this right now. A very painful loss. It gives me some comfort to know that she’s with Tom, Al, Pat and Garry. Rest In Peace, sweet Erin.”
Anson Williams, who played Richie and Ralph's close friend Potsie on the iconic sitcom, also remembered Moran. “Erin was a person who made everyone around her feel better," the actor wrote in a statement. "She truly cared about others first, a true angel. I will miss her so much, but know that she is in God’s hands. RIP sweet angel.”