Andrew Koenig and Kirk Cameron

Kirk Cameron says he is praying for his former Growing Pains co-star, Andrew Koenig, who has been missing for the past week.

"I am praying for his family during this time of distress and for his safe return," Cameron told People. "Andrew, if you're reading this, please call me."

Growing Pains star goes missing

Koenig, who played best friend Boner to Cameron's mischievous Mike Seaver on the '80s sitcom, was last seen on Feb. 14 during a trip to Vancouver. He did not return to California as scheduled on Feb. 16.

"Mike and Boner could always work things out when they put their minds to it," Cameron said. "I'm praying for you, pal. Hope to hear from you soon."

Watch full episodes of Growing Pains

Koenig, 41, is the son of Star Trek actor Walter Koenig. The elder Koenig wrote on his website that his son was suffering from clinical depression at the time of his disappearance and that he received a note from Andrew on Feb. 16 that had a "despondent tone."

Koenig's family asks that anyone with potentially helpful information contact Vancouver authorities.