Andrew Koenig's parents mysteriously walked out of an interview with talk show host Larry King just minutes before they were due to go on the air.
The former Growing Pains star hasn't been seen since February 14. He disappeared during a trip to Vancouver and was reported missing by a friend after failing to show up for his flight home to Los Angeles on February 16.
His parents, former Star Trek actor Walter Koenig and his wife Judy, flew to Vancouver this week to take part in a televised press conference to appeal for their son to come home.
On Wednesday they headed to a Vancouver TV studio for a link-up with Larry King Live, just days after their daughter Danielle spoke to the TV host about her missing brother.
But the Koenigs cancelled the planned interview just two minutes before they were due on air, according to King, who was left baffled by the couple's sudden decision to leave.
He told the TV audience, "For some reason unbeknownst to anyone, Walter Koenig, the father of the missing Andrew Koenig, and Judy Levin-Koenig left the studio in Vancouver. We checked them out, they were prepared to go on, I said 'Hello,' they said 'Hello.' We said we'd be on in two minutes, they said 'Fine.' And they got up and left, for reasons unknown."
Police in Vancouver have launched an investigation into Andrew Koenig's disappearance, combing the area for the 41 year old after receiving a number of reported sightings from locals on Vancouver Island.
