GlennMartinChristopherFrancisQuinn(May28,1970–December3,2002)wasanIrishactor.WhilehewasbestknownforhisportrayalofMarkHealyonthepopular'90sfamilysitcomRoseanne,QuinnalsoamassedalargefanbaseforhisportrayalofDoyle,ahalf-demon,onAngel,aspin-offseriesofBuffytheVampireSlayer.[1][2]