D.B. Sweeney D.B. Sweeney

D.B. Sweeney has signed on to guest-star in Castle's upcoming Los Angeles-set episode, TVGuide.com has learned exclusively.

Castle exclusive: Lie to Me star sets his sights on Beckett

After Beckett's former partner is killed, Castle (Nathan Fillion) and Beckett (Stana Katic) will head to Los Angeles to investigate, which also gives them the opportunity to visit the set of Heat Wave.

Sweeney will play Detective Kyle Seeger, a Los Angeles cop with Robbery Homicide, who questions Castle and Beckett about their rogue investigation.  

In the same episode, Off the Map's Jason George will play an entrepreneur who crosses paths with the duo, while Prison Break's Dominic Purcell will also appear as a Hollywood businessman.

Off the Map's Jason George checks into Castle

Sweeney, 49, most recently appeared on Hawaii Five-0 and The Event. His film credits include The Cutting Edge and Spawn.