Actor Gavan O’Herlihy, perhaps best known for being forgotten as Chuck Cunningham on the 1970s sitcom “Happy Days,” is dead at 70.
Variety reports O’Herlihy’s brother confirmed his sibling died last month in Bathe, England, but gave no cause of death.
O’Herlihy scored numerous roles over the years, including TV appearances on “The Six Million Dollar Man” and “Police Woman” and film parts in “Superman III” and “Never Say Never Again,” but in 1974, he played the brother of central “Happy Days” characters Richie and Joanie Cunningham.
O’Herlihy was replaced as Chuck by Randolph Roberts, then the character just disappeared from the popular sitcom with no explanation from the show’s writers.
Characters that get erased from programs as if they never existed have since been known as victims of “Chuck Cunningham Syndrome.”
Ron Howard remembered his long-lost TV brother on Twitter.
Chuck Cunningham was played by two other actors on the show. IMDB.com shows Gavan played the role nine times.
Henry Winkler, who played “Happy Days” character Arthur “Fonzie” Fonzarelli also paid his respects on social media.
“Gavin .. Rest In Peace .. It was a pleasure sharing the screen with you!!!” he wrote. “You walked up the longest staircase this time.”
It had long been joked by the show’s fans that the Chuck Cunningham character ascended the staircase on set that led away from the family room, where most of the action took place, and never came back down.
O’Herlihy, a Dublin, Ireland native, reportedly leaves behind a wife, three siblings and four sons.