Actor William Petersen was hospitalized after a health scare on the set of CSI: Las Vegas on Friday. Petersen had said he felt ill before asking for a break, his rep told TMZ. An ambulance was called on the actor’s behalf and he was taken to a medical facility. It’s possible that Petersen overexerted himself, as his reps say he’s been working long hours for the past few weeks. For now, Petersen is out of the hospital. It’s unknown when he’ll return to work.