Though no one has ever clearly stated why, Michael Fishman began playing the Conners' baby boy D.J. after the pilot, replacing another child actor, Sal Barone. Fishman was born Oct. 22, 1981 in Long Beach, Calif. Though he largely disappeared after Roseanne, Fishman also had roles in Walker, Texas Ranger, Seinfeld and the Stephen Spielberg film A.I. Fishman set up a benefit memorial fund for Roseanne co-star Glenn Quinn (Mark Healy), who overdosed on heroin in 2002.
David Jacob (D.J.) Conner is a pretty typical kid. He gets his head stuck in toilets, rats on his sisters, spies on girls in the bathroom, loves Halloween and enjoys being smothered by his mom and left to get in all manner of adventures by his dad. To Darlene he is "Spock," so-named for his haircut, which may indeed have originated on the planet Vulcan. To Becky he is "Little Perv," so named for his predilection for extraordinarily long stays in the bathroom. To everyone else, he is just D.J. He always seems to know what's going on in the Conner household, yet is somehow immune to the chaos. The only notable exception to this is when a cousin of Dan's, a tap-dancing fundamentalist preacher, stops by - and D.J. is suddenly caught up stomping out the fires of Hades in his living room in Lanford.