Terminator 3 star Nick Stahl, who was reported missing on Monday, reached out to friends late Friday to say he's okay and entering rehab, his wife tells PEOPLE.

"I'm relieved," says Rose Stahl, 30, who told PEOPLE earlier on Friday that she was worried her husband might die from an overdose.

"But I'm also skeptical that he really in rehab," she adds.

Rose Stahl, who on Monday reported her husband missing to the LAPD, says Nick sent an "unemotional and unapologetic e-mail" at about 10 p.m. on Friday, saying he's okay, that he was entering a 30-day rehab program that night, and that he planned to make some arrangements to get his clothes.

Rose says she didn't get the e-mail herself, but saw it because she has logon access to his e-mail account. She says the e-mail offered no explanation as to why he disappeared on May 9, and did not say whether he was on Skid Row using drugs as she suspected.