"Happy Days" co-star Erin Moran dies at 56.

Erin Moran who famously played Joanie Cunningham on "Happy Days" and its spinoff "Joanie Loves Chachi" has died.

Authorities in Indiana got a call just after 4 PM ET Saturday from someone reporting an "unresponsive female."  EMT's arrived and found Erin Moran's body ... she was already dead.  

Erin had a tough time after her "Happy Days" stardom ... a combination of drinking and bizarre behavior that eventually landed her in a trailer park in Indiana. She had run out of money and was reportedly kicked out of the mobile home she shared with husband Steve Fleischmann.

An autopsy is pending.

She was 56.

(Source: TMZ)

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