Nick Stahl had exhibited signs of "inner turmoil" before his wife reported him missing—and his family isn't giving up on the Terminator: Rise of the Machines star.

"He has been having a tough time for a couple of months," a source close to the actor exclusively tells E! News. "He's an incredible individual, an amazing father—but addiction is something he has always struggled with."

And, the source adds, this isn't the first time Stahl has seemingly disappeared.