“Rhoda” aired on CBS television from 1974 to 1978

Baby Rose Marie

Rose Marie played writer Sally Rogers on "The Dick Van Dyke Show"
on CBS from 1961 to 1966. She had a successful singing career as
child performer, Baby Rose Marie. As a teenager, she became a
nightclub performer before transitioning to a radio comedian.

 
  Ronald Gabriel "Ron" Palillo (April 2, 1949 – August 14, 2012)

(Fox News) – Ron Palillo, who played Horshack on the hit 1970s ABC-TV
sitcom "Welcome Back, Kotter," died Tuesday morning at his home from
an apparent heart attack, his rep confirms to FoxNews.com. 

Actor Don Most is best known for his role as Ralph Malph on the ABC
television series Happy Days (1974-1984).