American actor and producer William Petersen, best known for his performance as Gil Grissom on the CBS drama series CSI: Crime Scene Investigation, was taken to a nearby hospital in Los Angeles after he started feeling unwell on the sets of its upcoming sequel limited TV series, CSI: Vegas. The 68-year-old informed the director of CSI: Vegas during filming that he needed to take a break and departed from the set as a safety measure rather than it being a necessity. As of now, no official diagnosis has been given, according to TMZ, who first reported the news. Reports further state Petersen’s agent citing that the actor had been working continuously for the past three months, while mentioning that the health issues now were due to "overexertion or fatigue". Having said that, he is reportedly out of the hospital and on the road to recovery. 

William Petersen joined the cast of CSI: Crime Scene Investigation in a main role in 2000 and portrayed the graveyard shift supervisor character, Gil Grissom, for the first nine seasons, while making frequent appearances in later seasons, including the finale TV movie, Immortality. Apart from acting in a main role on CSI: Crime Scene Investigation, Petersen also served as an executive producer on the show and is once again doing the same in CSI: Vegas, which has been announced by CBS to premiere on October 6, 2021. 

Having starred in notable films like Manhunter, Young Guns II, Hard Promises, The Contender and Seeking a Friend for the End of the World to name a few, William Petersen is known to be a member of the prestigious Chicago-based Steppenwolf Theatre Company, while co-founding the Remains Theater Ensemble. Petersen won a Screen Actors Guild award for his work on CSI: Crime Scene Investigation, including landing nominations for a Golden Globe and three Emmys as a producer.