<P> Glenn Martin Christopher Francis Quinn (May 28, 1970--December 3, 2002) was an Irish actor . While he was best known for his portrayal of Mark Healy on the popular' 90s family sitcom Roseanne, Quinn also amassed a large fan base for his portrayal of Doyle, a half - demon, on Angel, a spin - off series of Buffy the Vampire Slayer . </P> <P> Quinn was born in Dublin, Ireland on May 28, 1970, the son of Murty Quinn, a musician and singer with the Miami Showband who enjoyed seven #1 hits in the' 60s and' 70s, and his wife, Bernadette Quinn (nee Brady). He was raised in Cabinteely, a suburb of Dublin, and attended Clonkeen College . He immigrated to the United States with his mother and two sisters, Sonja and Louisa, in 1988, when he was still just a teenager, with the family settling in Los Angeles, California . Quinn had a third sibling, a brother Ciaran, whom he never knew existed as the boy had been placed for adoption . </P> <P> Quinn did commercials for Pepsi and Ray - Ban, appeared in the music video for the Richard Marx song "Satisfied," and had his first speaking line in the pilot of Beverly Hills, 90210 after having endured eight separate auditions for the role of "Brandon Walsh" and then "Steve Sanders" (played by Jason Priestley and Ian Ziering, respectively). Casting director Johanna Ray gave him a small role with two lines in the pilot, but Quinn was barely visible in the final broadcast version . His first substantial speaking part was as a guest star in an episode of the short - lived series The Outsiders . </P> <P> In 1991, Quinn had his first major role in the movie Shout, which starred John Travolta and in which Quinn shared an on - screen kiss with Gwyneth Paltrow in her debut film . </P>

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