won the minor role of a car-radio thief named Earl the Hamster, but decided to wait for a bigger part. With the opportunity presenting itself, Martin approached Law & Order producer Dick Wolf regarding the opening. Wolf hoped to cast him, and upon hearing that CBS and Fox both offered Martin development deals, he gave the actor the part without an audition. From 1999 to 2008, he played Detective Edward "Ed" Green on Law & Order. Altogether, he was the fifth-longest serving cast member behind S. Epatha Merkerson, Sam Waterston, Jerry Orbach, and Steven Hill. He had a brief hiatus at the end of the 2004–2005 season while he was filming the movie adaptation of Rent in which he reprised the role of Tom Collins. Martin's final episode of Law & Order aired April 23, 2008, as he was replaced by Anthony Anderson. Martin returned to NBC a year later as the co-star of The Philanthropist. On September 14, 2012, NBC announced that Martin would be joining the cast of Smash during season two for a nine-episode arc as Scott Nichols, the artistic director of the Manhattan Theatre Workshop. Martin also starred in an NBC pilot called The Secret Lives of Husbands and Wives as Greg Cooke, however it was not picked up to series. Martin currently portrays Joe West in the superhero series The Flash, a spin-off from Arrow which premiered in October 2014. In the third season episode "Duet", Martin played gangster Digsy Foss in Barry and Kara's dreamworld. In its fifth season in 2018, a back injury forced Martin to take medical leave following the season's fourth episode. From the start of the season until then he was almost always leaning against a wall or sitting down. Martin returned from medical leave in January 2019 with the season's fifteenth episode. He departed as a series regular after the eighth season, having been cast in the NBC pilot Irrational, though he is expected to recur. Film work On March 4, 2013, it was announced that Martin would replace Lenny Kravitz as Marvin Gaye in Sexual Healing, an upcoming biopic directed by Julien Temple, and produced by Vassal Benton and Fred Bestall. Martin had been attached to the Marvin Gaye biopic for years and had stated that it was his dream role to portray the legendary Motown singer. With only three weeks to go on a planned nine-and-a-half week