Ritchson is a former model and musician who branched out into acting following an appearance in the third season of American Idol. In addition to his current role on Titans, where he plays the football player turned superhero Hank “Hawk” Hall, he has appeared in The Hunger Games: Catching Fire, the 2014 Michael Bay Teenage Mutant Ninja Turtles reboot, Black Mirror, and Smallville. In the latter role, Ritchson was the first actor to ever play Aquaman in a live-action production. Ritchson will reportedly continue to appear on Titans while working on Jack Reacher.
It’s worth noting that Cruise’s role as Reacher was and is known as being one of the stranger mismatches between character and actor in a Hollywood adaptation. Cruise is notoriously short, while Reacher is always described in the books as looking like an angry shaved bear. Dwayne Johnson was up for the part of Reacher at one point—which is really the sort of actor one should have in mind for Reacher; anyone who doesn’t have his own zip code need not apply—but was passed over and ended up making the fifth Fast and the Furious movie instead. Ritchson, who’s 6'4" and 235 pounds, is physically more in line with Reacher as the books present him.
Source: Deadline