- Actor Michael Fishman, who co-starred with Quinn on Roseanne, set up a memorial fund in his name.
- His character Mark Healy on Roseanne (1988) was intended to be a one-episode guest appearance, but became a seven-year stint.
- Though allowed to use his native Irish accent in the show Angel (1999), it was so thick that he had to occasionally "Americanize" it so you could understand what he was saying. This sometimes made it sound as if his accent was fading in and out.
- Was a co-owner of Goldfingers, a 007 themed nightclub in Hollywood.
- He died at a friend's house when he overdosed on heroin.
- Though originally from Dublin, Ireland, most of Quinn's roles have called for him to hide his Irish accent and don an American one. The WB series Angel (1999) was his first role in an American series where he was allowed to use his own brogue. Quinn's first screen kiss was in Shout (1991) with Gwyneth Paltrow. While still playing Mark on Roseanne (1988), Quinn also took a role as youngest son Cedric on a series called Covington Cross (1992). But while Roseanne (1988) filmed in the US, Covington Cross (1992) was filmed in England, which gave the actor one hell of a commute.
- Was good friends with Charisma Carpenter.
- Did dead-on impersonations of Sesame Street (1969)'s Grover and Christopher Walken.
- Worked in a factory, painted houses and waited tables before getting discovered.
- Had a tattoo "Erin Go Bragh" (Ireland Forever) on his right shoulder, and a Harp on his left.
- Liked hiking, soccer, motor sports and playing the drums and guitar.
- Grew up in Cabinteely, Dublin, Ireland down the street from Cinematographer / Producer Noel Donnellon and Animator / Director Paul Donnellon.
- Attended Clonkeen College, a Roman Catholic Christian Brothers school, in Blackrock, near Dublin.
- Had two sisters - Sonya and Louisa.
- Favorite band was U2.
- He was spotted by casting director Johanna Ray, who helped him get representation.
- His father Murty is a musician who played with Dickie Rock and the Miami Showband, and later The Sands with Tony Kenny.
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