American actress Erin Moran, who played Joanie in 1970s US sitcom Happy Days, has died in Indiana, at the age of 56.
The cause is not yet known, but speculation on social media claims she died of a suspected heroin overdose at her trailer park home in New Salisbury, Indiana.
Moran also starred in the spin-off Joanie Loves Chachi. She played Joanie Cunningham, the young sister of of Richie Cunningham, in the comedy set in 1950s Milwaukee.
Henry Winkler, who played The Fonz, tweeted, “Oh Erin. Now you finally have the peace you wanted so badly on earth”. She joined Happy Days in 1974 aged 13.