Joyce Bulifant from "The Match Game"
Involved in Child Abuse Prevention organizations; but, more importantly, became the mother-in-law of Jenny McCarthy.
Jon Walmsley (Jason Walton on "The Waltons")
Currently plays a pirate at Disneyland
Peter Bonerz (The orthodontist on "The Bob Newhart Show")
Periodically directed a bunch of sitcoms; also directed Police Academy 6: City Under Siege
Fred Berry (Rerun from "What's Happening?")
Lost 100 pounds, married six times, and became a Baptist preacher. Died of a stroke.
Lara Jill Miller (Tomboy Samantha on "Gimme a Break!")
Earned a law degree; practiced law in New York, New Jersey, and Pennsylvania. Returned to Hollywood and does voice acting for kids shows (Higgleytown Heroes, Curious George, etc.)
Whitman Mayo (Grady from "Sanford and Son")
M.I.A. for a long time, promting Conan O'Brien to launch the "Where's Grady?" search. Ultimately, Whitman spent his later years in retirement and passing away at, get this, GRADY Memorial Hospital!
Adam Rich (Nicholas from "Eight Is Enough")
You may have heard of the legal troubles Rich has gotten into via his substance abuse. On one occasion, he busted into a pharmacy, and had to be bailed out by Dick Van Patten. Fairly recently, he crashed into a police car while driving drunk. A freaking shame - I loved Nicholas when I was a kid.
Jack Wild (Jimmy from "H.R. Puffinstuf")
Jack became a big time alcoholic. It ruined his marriage, career and health. He ended up living with his retired father, then made a brief comeback before his death at the age of 53.
Jameson Parker (the straight laced Simon from "Simon and Simon")
Wrote a couple books, one autobiographical. In 1992, Jameson was shot by his next door neighboor. Jameson survived and the neighbor got nine years in prison (yes, he's out now - hopefully not planning on gunning down the other Simon).
Roz Kelly (Pinky Tuscadero from "Happy Days")
In 1998, she pled guilty to firing a 12 gauge shotgun into a neighbor's living room (the car alarm was bothering her). In 2001, she went to jail for assaulting someone with her cane.