Freddy Boom Boom Washington has maintained a career - just lower key parts. He played Joe Jackson in The Jacksons - and American Dream and various other "Lifetime" type films. Horshack was killed by Jason in one of the Friday the 13thsI grew up watching Welcome Back, Carter in reruns in the late 1970s and early 1980s.
Funny what's happened with the cast since then.
Really, Travolta and the Gabe's wife on the show (forget her real name -- Marcia Strassman?) have been the only cast members that have had lasting careers in front of the camera.
Still stings when you see people you recognize pass away at early ages...