Marg Helgenberger (left) Jorja Fox, William Petersen and Ted Danson in Sunday's series finale of "CSI," ending its 15-year run. Sonja Flemming/CBS ...

William Petersen is leaving "CSI: Crime Scene Investigation," a move that might have fans of his brainy crimebuster Gil Grissom screaming bloody murder.

William Petersen: This had been coming for years. The decision wasn’t made overnight. I’d been talking to our showrunners about the best way to play it all out.

The question, and the characters gathered for the scene — Grissom (William Petersen), the former Las Vegas crime-scene-investigation team leader, colleague Catherine Willows (Marg Helgenberger ...

William Petersen on life after CSI. The actor, who played Gil Grissom in CSI, tells Neil Midgley why he loves his new life on stage. By Neil Midgley 07 January 2010 • 5:46pm .

So William Petersen, once William L. Petersen, venerable Chicago actor, maestro of the Remains Theatre, bon vivant, actor’s actor, decadelong star of “CSI: Crime Scene Investigation,&#8… ...

This Sept. 16, 2015 combination file photo shows William Petersen, left and Jorja Fox at the 2015 PaleyFest Fall TV Previews in Beverly Hills, Calif.

CBS "The reason I'm leaving is because I'm afraid I'm becoming too comfortable. It's 'CSI' -- they pay me a lot of money, and I don't have to work very hard anymore. I've got it all figured out.

EXCLUSIVE: William Petersen’s return to television is being put on hold. I’ve learned that the CSI alum is leaving the Cinemax/GK-tv drama pilot Hurt People, which he was to executive produce ...

EXCLUSIVE: Hurt People, GK-tv's drama project starring and executive produced by William Petersen, has landed at Cinemax. The HBO sister network has ordered a pilot from the project, which marks ...