Andrew is the son of Walter Koenig - better known as Star Trek's Chekov
The actor son of Star Trek veteran Walter Koenig has disappeared while visiting friends in Canada, police say.
Andrew Koenig, 41, was last seen in Vancouver on 14 February - two days before he was due to fly back home to Los Angeles.
Police said he had "recently been despondent and his family and friends are concerned for his well-being".
Andrew is best known for his recurring role as Boner on US sitcom Growing Pains between 1985-1989.
Walter Koenig, 71, who played Chekov in the original Star Trek series and films, told a local news TV station: "He's been depressed - he's trying to get ahead in this business and he's been working at it a long time."
The star posted additional details on his website, where he called his son "a funny, caring, gifted and passionate multi-talented young man", adding he and his wife would fly to Vancouver on Tuesday to join the search.
Vancouver police constable Tim Fanning said investigators had been working to find the 41-year-old since getting the missing persons report last Thursday.
"There's nothing right now to believe that anything has happened to him," he said.
"We're certainly very concerned, as his family and friends. But there's no evidence to believe that there's foul play involved at this point."
He added bank transactions and mobile phone records made since the time of Andrew's disappearance had helped give police some clues.
Investigators have focused their search in Vancouver's 1000-acre Stanley Park, where Koenig liked to walk and was last seen.