Nick Stahl Credit: Jesse Grant/

More trouble for Nick Stahl.

After his mysterious disappearance in May -- which was followed by a rehab stay -- the Terminator 3 actor, 32, has gone missing once again.

"He's been missing for four days," his wife, Rose Stahl, told E! News on Monday. "But I don't want to comment any further."

Stahl is said to have checked out of rehab last week against doctor's orders and, E! reports, went to stay at a friend's house in the L.A. area, where he was last seen on Thursday.

"Now he's disappeared," a source told the site, adding that Stahl had been seen in downtown L.A.'s notorious Skid Row area prior to his second disappearance. "We can't find him anywhere. He has not made contact with anyone. We are all just desperately looking for him."

Rose has previously filed court papers expressing concern over Nick's substance abuse problems.

"He wants to be well," she has said. "He's a good man."