The episode is called One To Go.
I believe Grissom's final episode on CSI was Season 9, episode 10 - One to Go.
Gil Grissom was played by William Petersen.
Yes, Sara Sidle and Gil Grissom have a baby via adoption in the later seasons of CSI. They adopt a child named Lilly.
No he did not die, he just resigned, to be with Sara
No, Sarah Sidle and Gil Grissom are colleagues and have a close relationship but they are not married on the CSI television series. They share a strong professional and personal bond throughout the show's run.
Sara Sidle, she is also a csi she is played by Jorja Fox
Forensic entomology
Yes, in the TV show "CSI: Crime Scene Investigation," Gil Grissom and Sara Sidle get married. They elope in the series finale.
No one narrates the CSI series. The grave supervisor is Gil Grissom, but it is not told in his view. The POV (point of view) is in an onlooker's view.
CSI:'s Gil Grissom has never gone to Miami to help with a case but during the CSI: Episode Cross Jurisdiction he sends Warrick and Catherine to Miami, and corresponds with them periodically through out the show.
narrating Sons Of Anarchy, as the dead father of Jax
William Petersen, who portrayed Gil Grissom, decided to leave CSI to pursue other opportunities after being on the show for several years. He wanted to focus on his theater projects and other acting roles.