The former Happy Days star was found unresponsive by first responders on Saturday.

CNN reports that Moran was found by authorities after receiving a 911 call Saturday afternoon. The cause of death is undetermined and an autopsy is planned.

Erin Moran played Joanie on Happy Days and one of its spin-offs, Joanie loves Chachi. Watch the video below to see highlights of Moran's time as Joanie Cunningham.

More From 99.9 KTDY