Glenn Quinn | During my most hormonal years, he was the only reason I was still watching "Roseanne" anymore. I mainly preferred the show BEFORE Darlene got all broody and wore black all of the time. Anyway, he is sadly another actor who died too young on account of a drug addiction.
Glenn Quinn. Played Doyle on Angel. Such a shame he passed.
Glenn Martin Christopher Francis Quinn (May 28, 1970 – December 3, 2002) was an Irish actor in television and film, known for playing Mark Healy in the American sitcom Roseanne, and Doyle, a half-demon, on the 1999–2004 television series Angel, a spin-off series of the television series Buffy the Vampire Slayer.