NCIS Season 22: Who Plays Gabriel LaRoche?

Contains spoilers for "NCIS" Season 22, Episode 17 — "Killer Instinct"

"NCIS" regular Timothy McGee (Sean Murray) is having one terrible Season 22. He can't stand Deputy Director Gabriel LaRoche (Seamus Dever) because the man loathes the NCIS team's chumminess and family-like familiarity with one another — and because he thinks LaRoche is the one who burned Nick Torres (Wilmer Valderrama), ruining his backstory during the Nexus cartel sting. He also suspects LaRoche has his eyes on Tim's family and is looking to get McGee kicked out of NCIS. 

Now Tim and his wife, Delilah (Margo Harshman), are being forced to eat dinner with LaRoche. Why? Notorious assassin The Poet has been unmasked as Paul Morton (Morgan Peter Brown), and he refuses to cough up vital info about who hired him before dramatically committing suicide in the interrogation room. While the team tries to locate The Poet's fence in the hope of tracking down who hired him in the first place, Tim sneaks around LaRoche's home, hoping to find evidence that connects him to the assassins' crimes. But it turns out the Poet's client wants to mop up the mess he's left behind — and that includes not just Tim, but LaRoche as well.

While he's been playing a baddie throughout Season 22 of "NCIS," Seamus Dever is best known for playing the winningly caustic but good-hearted Kevin Ryan in the ABC procedural "Castle." Here's why else he might look familiar to you.

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Seamus Dever got his start where many an actor does — on soap operas. After recurring on MTV's "Undressed" as Randy and popping up in minor roles on cop shows like "Without a Trace," "Cold Case" and "JAG," he became Dr. Ian Devlin on the long-running soap "General Hospital." Secretly trafficking drugs for mobster Claudia Zacchara (Sarah Brown), the dirty doc soon found himself embarking on errands for her criminal empire, like trying to kill fellow mobster Sonny Corinthos (Maurice Benard) and kidnapping heroine Maxie Jones (Kirsten Storms). Devlin was ultimately slain by Sonny's right-hand man, Jason Morgan (Steve Burton).

Dever continued to advance his career, appearing in the film "Hollywoodland" as Phillip, and in "Mad Men" as Chuck. He played Dr. Chris Ferlinghetti on "Army Wives, where he had a torrid seven-episode affair with Denise Sherwood (Catherine Bell). He was also the interdimensional demon Trigon in the Max series "Titans." 

On top of all of that, Dever has something of a golden voice; he has a long history of putting words in the mouths of video game characters. You can hear him as a variety of minor personalities in "Soldier of Fortune II: Double Helix," Felix Neuman in "Call of Duty: Black Ops 6" and as John Seed in "Far Cry." He's also occasionally put his vocal chops on display, singing at conventions and in cabaret charity performances. Perhaps "NCIS" will let him belt out a tune before his time on the show is through.