Joshua Regnall Stewart (born February 6, 1977) is an American actor best known for his role as Holt McLaren in the FX TV series Dirt and as Detective William LaMontagne, Jr., in Criminal Minds. He was also cast as Brendan Finney in the final season of the NBC TV series Third Watch and as Barsad in Christopher Nolan's The Dark Knight Rises.
Stewart was born in Diana, West Virginia, the son of Margie and Charles Regnall Stewart. His father was a high school physical education teacher as well as a former pastor of the First Baptist Church in Webster Springs and Holly River Baptist Church, and is now pastor at the Redeeming Grace Baptist Church in Webster Springs. His mother is a sixth grade teacher at Webster Springs Elementary. Stewart first attended West Virginia Wesleyan College, then transferred to West Virginia University, where he studied business. After graduating from WVU, he moved to New York City to pursue acting.