Man, all this time and I never knew he was Walter Koenig's (aka "Chekov" from Star Trek TOS) son.
Article statemtns such as this one from that article linked above:
His parents, Walter (“Star Trek’s” original Pavel Chekov) and Judy Koenig, told TMZ that their son was “suffering from depression.”
“(He was) not doing good” at the time of his disappearance, they told the site, adding that they planned to fly to Vancouver in the coming days.
aren't exactly encouraging. I can't help but think that he will be found, but not in the way people are hoping for.