Glenn Quinn

Dear Stacy: Whatever happened to the actor who played Mark on “Roseanne”? - Danny V., Bronx, N.Y.

Dear Danny: Dublin-born Glenn Quinn died of a heroin overdose at a friend’s house in North Hollywood in December, 2002. He had also played the character of Allen Doyle on “Angel,” and his former cast mates and friends David Boreanaz and Christian Kane talk about him and how much they miss him on the Season 5 DVD commentary.