"How did Grissom, Walker, and Sidle go? I'm a starting fan. hehe."

At the season 7 finale (episode Living Doll), Sara was kidnapped and trapped under a car in the desert. She was rescued in the season 8 premiere (Episode Dead Doll), but suffered emotional damage. After that, she had a hard time dealing with cases, especially because she had come from an abusive family (her father was abusive towards her mother, and her mother killed her father when sara was 12). She had an emotional break, and left to visit her mother in San Francisco and to bury her ghosts (episode Goodbye and Goodluck). She returned after hearing news of Warrick (see below), but left after another difficult case she saw (episode The Happy Place). She went to study in Costa Rica. She returned again in the season 10 premiere in light of the understaffed night shift, and because she missed the crew. She is now a CSI again.

Well, unfortunately, Warrick was killed. He was trying to bring down a mafia type criminal/murderer named Lou Gedda, and when Gedda was killed, Warrick was framed. Eventually, the CSIs cleared him, but Warrick suspected that Gedda had a mole who was working inside the Police Department. The mole was the Undersheriff Jeff McKeen, and when Mckeen knew that Warrick was onto him, he shot him several times in the neck. This was the end of season 8 (worst cliffhanger ever!). In the season 9 premiere, Warrick died in Grissom's arms.

Grissom retired a few episodes after Warrick's death, realizing that he missed Sara (who at the time was still in Costa Rica), and it was his time to go. I think he left in the episode "One to go", but I'm not 100% positive. He went to Costa Ricca to see Sara. He is still retired, but is still giving lectures/seminars (currently in Paris).

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