Koenig, 41, who played Richard "Boner" Stabone on the 1980s sitcom, was reported missing last week in Vancouver, British Columbia.

The father of missing actor Andrew Koenig fears his son's bouts of depression are behind the "Growing Pains" actor's disappearance, but police believe Koenig may just be lying low.

"He's been depressed," his father, "Star Trek" actor Walter Koenig told ABC News. "He's trying to get ahead in this business, and he's been working at it a long time."

Before Andrew left California for Vancouver, he got rid of a lot of personal belongings and even returned gifts to friends.  Now  flight documents show he did not board his return flight back to California, and no one has seen or heard from him. A co-worker he did several film projects with said, ""I was away, I was in Florida, and he dropped off a bag of things of mine that he had," Miccio said. "He hooked it on my doorknob -- a plastic bag of video tapes and stuff we had worked together on. Even gifts I had given him. He just returned everything, with no note or anything."

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The family is asking that anyone with information contact Detective Raymond Payette
of the Vancouver Police Department at 604-717-2534.