9 Moments From The 15th Season Finale of CSI

The CSI unit faces the final showdown with the Gig Harbor killer whose motives are finally revealed. Also, Nick Stokes makes a decision that will affect the entire team moving forward, on the 15th season finale of CSI: CRIME SCENE INVESTIGATION, Sunday, Feb. 15 (10:00-11:00 PM ET/PT) on the CBS Television Network. Pictured: George Eads Photo: Robert Voets/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

The CSI unit faces the final showdown with the Gig Harbor killer whose motives are finally revealed. Also, Nick Stokes makes a decision that will affect the entire team moving forward, on the 15th season finale of CSI: CRIME SCENE INVESTIGATION, Sunday, Feb. 15 (10:00-11:00 PM ET/PT) on the CBS Television Network. Pictured: Robert David Hall Photo: Robert Voets/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

The CSI unit faces the final showdown with the Gig Harbor killer whose motives are finally revealed. Also, Nick Stokes makes a decision that will affect the entire team moving forward, on the 15th season finale of CSI: CRIME SCENE INVESTIGATION, Sunday, Feb. 15 (10:00-11:00 PM ET/PT) on the CBS Television Network. Pictured: David Berman Photo: Robert Voets/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

The CSI unit faces the final showdown with the Gig Harbor killer whose motives are finally revealed. Also, Nick Stokes makes a decision that will affect the entire team moving forward, on the 15th season finale of CSI: CRIME SCENE INVESTIGATION, Sunday, Feb. 15 (10:00-11:00 PM ET/PT) on the CBS Television Network. Pictured: Elisabeth Shue Photo: Robert Voets/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

The CSI unit faces the final showdown with the Gig Harbor killer whose motives are finally revealed. Also, Nick Stokes makes a decision that will affect the entire team moving forward, on the 15th season finale of CSI: CRIME SCENE INVESTIGATION, Sunday, Feb. 15 (10:00-11:00 PM ET/PT) on the CBS Television Network. Pictured: George Eads Photo: Robert Voets/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

The CSI unit faces the final showdown with the Gig Harbor killer whose motives are finally revealed. Also, Nick Stokes makes a decision that will affect the entire team moving forward, on the 15th season finale of CSI: CRIME SCENE INVESTIGATION, Sunday, Feb. 15 (10:00-11:00 PM ET/PT) on the CBS Television Network. Pictured: Elisabeth Shue Photo: Robert Voets/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

The CSI unit faces the final showdown with the Gig Harbor killer whose motives are finally revealed. Also, Nick Stokes makes a decision that will affect the entire team moving forward, on the 15th season finale of CSI: CRIME SCENE INVESTIGATION, Sunday, Feb. 15 (10:00-11:00 PM ET/PT) on the CBS Television Network. Pictured: Ted Danson Photo: Robert Voets/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

The CSI unit faces the final showdown with the Gig Harbor killer whose motives are finally revealed. Also, Nick Stokes makes a decision that will affect the entire team moving forward, on the 15th season finale of CSI: CRIME SCENE INVESTIGATION, Sunday, Feb. 15 (10:00-11:00 PM ET/PT) on the CBS Television Network. Pictured: Ted Danson Photo: Robert Voets/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

The CSI unit faces the final showdown with the Gig Harbor killer whose motives are finally revealed. Also, Nick Stokes makes a decision that will affect the entire team moving forward, on the 15th season finale of CSI: CRIME SCENE INVESTIGATION, Sunday, Feb. 15 (10:00-11:00 PM ET/PT) on the CBS Television Network. Pictured: George Eads, Eric Smanda, and Jorja Fox Photo: Robert Voets/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved