Born in Roseau, Minnesota, Garrett spent his early years growing up
on a farm in a small town. When he was in the ninth grade his family
moved to Scottsdale Arizona, where he began taking private acting
lessons. After graduating high school, he immediately moved to Los
Angeles to pursue an acting career.

One month later, he'd landed
the role of Achilles' cousin Patroclus in the major motion picture Troy
(2004) opposite Brad Pitt. His next feature was Friday night lights
(2004) starring Billy Bob Thornton, in which Garrett played a high
school football player.

He then landed a starring role opposite
Mark Wahlberg in Four Brothers (2005), playing one of four brothers
whose mother is murdered.