In Season 10 of "NCIS: Los Angeles," Kerr Smith plays FBI Special Agent David Ross in the Episode 14 and 15 arc. The team join forces with the FBI to find a terrorist cell. Agent Ross seems to be cooperating with the team, and they discover a young man named Jalal (Amir Kamali), who seemingly has ties to the terrorist group. Beale (Barrett Foa) discovers that a specific intersection seems to be of interest to the terrorists, and when they get there, they realize it's a movie theater. As they're trying to get everyone out of the building, Jalal walks in wearing a bomb. The episode ends as the bomb goes off.
In the follow-up episode, the OSP team realize that Agent Ross is dirty, and he bombed the movie theater as a distraction, and to try to make the team think jihadist terrorists were responsible. He had been working on his own to try to get to a South African gunrunner before anyone else could realize what was happening. Things weren't adding up, and that jihadists wouldn't be working with South African mercenaries. Luckily the OSP team figured things out before anyone else could get hurt.
Kerr's performance in this episode was professional and serious, but there were definitely points where it seemed something was off with his character, which seemed to be a bit of foreshadowing for viewers paying attention. Kerr's last major role was as Jacob Yorn in the series "The Resident" with Emily VanCamp.
