Freshman at Beacon Hills High School and friends with Mason, Liam, and Violet. He's dating Violet. He tries out for the lacrosse team and is apparently also a teenage assassin involved with the deadpool.
Garrett tries to get Scott to stop Violet's transfer to a federal facility by having him attack Rafael McCall and Sheriff Stilinski's vehicle, but the berserkers beat him to it. A berserker then runs Garrett through, killing him.