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Gil Grissom was played by William Petersen.
I believe Grissom's final episode on CSI was Season 9, episode 10 - One to Go.
Yes, in the TV show "CSI: Crime Scene Investigation," Gil Grissom and Sara Sidle get married. They elope in the series finale.
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