Martin Hart is a fictional character from the television series True Detective. He is portrayed by actor Woody Harrelson and serves as one of the main protagonists in the show's first season. Hart is a Louisiana State Police detective who investigates a series of ritualistic murders alongside his partner, Rust Cohle, played by Matthew McConaughey. Throughout the series, Hart's character is depicted as a complex individual, grappling with personal issues and moral dilemmas. His professional life is intertwined with his troubled family relationships, showcasing the challenges he faces both in his career and personal life.