On the original show, David's brother, Mark, was played by Glenn Quinn. Because Quinn passed away in 2002, his character in the reboot has also died, and this affects David.

Johnny Galecki is probably the best-known Roseanne veteran to have appeared on The Big Bang Theory, but he's far from the only actor to pop up on both shows.

The hit "Roseanne" revival came to a shocking end when the main character suddenly passed away. But that was just fiction. What happened in real life to the cast of "Roseanne" is much sadder.

Galecki played Darlene Conner’s (Sara Gilbert) boyfriend-turned-husband David Healy from 1992 to 1997 on Roseanne. He appeared in one episode of the show’s 2018 revival and then four episodes ...