<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> 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>
what was the guy 's name that played mark on roseanne
what was the guy 's name that played mark on roseanne
Glenn Martin Christopher Francis Quinn
Glenn Martin Christopher Francis Quinn