Erin Moran, best known for playing Ron Howard's little sister on the classic sitcom "Happy Days" has died. The Harrison County Sheriff's department confirmed that Moran was found dead Saturday by EMTs who were called to her home in Indiana. Moran played Joanie Cunningham on the 70s sitcom and in the spinoff "Joanie Loves Chachi." Moran was 56. An autopsy will be performed to determine the cause of death.