Following the news that the actress, who played Joanie Cunningham in the family sitcom and its spin-off Joanie Loves Chachi, died at the age of 56 on Saturday from as-yet-undetermined causes, several of her co-stars have spoken out to commemorate the actress. Ron Howard, who portrayed her brother Richie Cunningham on the hit series, wrote on Twitter, Such sad sad news. - Henry Winkler (@hwinkler4real) April 23, 2017 Meanwhile, co-star Don Most, who portrayed Ralph in the show, released a statement to The Hollywood Reporter, saying, I am so incredibly sad to hear about Erin. - Patrick Armijo (@patrickarmijo) April 23, 2017 Moran, who also appeared on The Love Boat and Murder, She Wrote, publicly struggled with alcoholism and financial stresses following her meteoric rise to fame as a child star. The Harrison County Sheriff's Department in Indiana confirmed that officers were called to her home on Saturday in response to reports of an unresponsive woman onsite and found her deceased from unknown causes. An autopsy is pending to determine the cause of Moran's death.