Stahl checked out of rehab against doctors' advice a week ago, then went to stay at a friend's house for a few days. He has not been seen publicly or made contact with his loved ones since Thursday night, a source close to the "In the Bedroom" and "Terminator 3: Rise of the Machines" star told E! News.
"He's been missing for four days," Stahl's wife, Rose Murphy Stahl, confirmed to the entertainment news outlet Monday. "But I don't want to comment any further."
The 32-year-old actor entered the undisclosed rehabilitation facility last month after his wife told police he had been missing for several days and she feared he had died of a drug overdose.
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