Dean Winters (born July 20, 1964) is an Irish American actor, perhaps best known for his portrayals of Ryan O'Reily on HBO's Oz, Johnny Gavin on FX Network's Rescue Me, and Dennis Duffy on NBC's 30 Rock.

Credits

He has appeared in the television series Law & Order: Special Victims Unit and very recently on Law & Order: Criminal Intent. He has also made guest appearances on Sex and the City, Third Watch, NYPD Blue, CSI: Miami and 30 Rock as well as previously having a starring role in Rescue Me. He also starred in the 1999 romantic comedy Undercover Angel with Yasmine Bleeth and the 2002 direct-to-video horror film Hellraiser: Hellseeker. He played Tom in PS, I Love You. Winters played Detective Sam Tyler's father in the US version of Life On Mars. He also played Charley Dixon, Sarah Connor's love interest, in Terminator: The Sarah Connor Chronicles.

Winters was born in New York City, and has three younger siblings: Bradford (a writer), Scott William, and his sister Blair. Scott is also an actor, and portrayed Ryan O'Reily's brother Cyril on Oz.