I was shocked over the weekend when I heard Erin Moran, who played "Joanie" on Happy Days, had passed away at only 56. She was good friend with co start Cathy Silvers who played "Jenny Piccalo". Many suspected a heroin overdoes, but an autopsy report says no. More on that here
Although they were close Cathy didn't know Erin was suffering from stage four cancer until February.
photo: getty images