Jimmie Walker was raised in a violent and abusive home in the Bronx. Starting in small clubs and eventually opening for Black Panther rallies, he ultimately became an icon playing J. J. Evans on Good Times . Walker was the first successful young black sitcom star, and his catchphrase--"Dyn-o-mite "--remains an indicator of the era. He saw sudden and enormous fame in everything from comic books and a talking doll to pajamas, trading cards, a bestselling...