David O'Hara is an actor known for bringing rough-edged intensity to his supporting roles. Fans may remember him as McCann, the gritty enforcer in Jon Favreau’s sci-fi western Cowboys & Aliens, where his presence added tension and credibility to the film’s ensemble. He also appeared in Wanted as Razor, delivering a character that was both fearsome and grounded, fitting well in Timur Bekmambetov’s stylish action thriller. O'Hara often shines in historical or fantastical settings, such as his turn in Tristan & Isolde, where he provided a grounded, compelling presence in the medieval romance. With his distinctive voice and raw physicality, O’Hara tends to breathe life into characters who exist on the edges of the story, making them unforgettable even in supporting roles.