The Salt actor will play Detective Tomas "TJ" Jaruszalski, the partner of Rex Winters (Ulrich). TJ is described as a confident Los Angeles native with a disdain for the entertainment industry and an active social life, according to casting breakdowns. He sees the world as a complex place with lots of gray areas, which helps him both get into the heads of criminals and win them over.
Stoll's casting was first reported by Deadline.
Production of Law & Order: Los Angeles is scheduled to begin Monday. The series premieres Wednesday, Sept. 22 at 10/9c on NBC.