Walter Koenig & Wife Worried About Missing Son

"Star Trek" star Walter Koenig and his wife Judy are speaking out to ET about their missing son Andrew Koenig, who has was last seen in Vancouver on February 14.

Speaking to ET Sunday morning via telephone from their Los Angeles home, Walter and Judy fought back tears and spoke lovingly of their 42-year-old son, who Walter described as being "in a depressed state."

"We heard from him in early February when he was staying with friends in Toronto," said Judy. "He sounded fine, but I was worried about him."