Knew he wanted to be an actor after seeing the docudrama Brian's Song at age 8
Lived on the streets of Boston after dropping out of school at age 12
Spent five years in prison in the early '90s, and turned to acting following his release
Made his film debut in the 1998 drama Southie, about a gang in South Boston
Cowrote and directed the semiautobiographical film What Doesn't Kill You, starring Mark Ruffalo and Ethan Hawke, which premiered at the 2008 Toronto International Film Festival
Has landed recurring roles on several prominent series, such as ABC's Lost, Castle and Revenge, as well as TNT's crime-drama Rizzoli & Isles