Former "Terminator" child star Nick Stahl has gone missing again. The 32-year-old actor, who starred as John Conner in "Terminator: Rise of the Machines" has been missing for four days after he checked himself out of a rehabilitation facility last week. Stahl reportedly entered rehab in May and was scheduled to stay for 30 days. However, he went against the doctor's advice and checked out, sparking fears for his safety and whereabouts once again.