Walter Koenig had previously issued a plea to the public asking for help in finding his son, last seen in Vancouver. Andrew had allegedly sold his possessions and had written a letter to his parents, and while the contents of the letter are not public knowledge, the intent scared the Koenigs enough to come in search of their son, fearing he would hurt himself.
Andrew Koenig was an actor with a very limited career. His biggest claim to fame was an 80's sitcom Growing Pains. Andrew played "Boner", the lead characters best friend, where he didn't have a defining role in the show, he instead was a supporting character, the type that often make shows worth watching, and he did his role well. Andrew had what, in my opinion anyway, was the most defining and poignant moment in the entire run of the show in his last appearance where he says goodbye to Mike to go join the marines. I was going to try and find a clip of this, but without the rest of the shows as a background it would have been trite and schmaltzy, not the image I want to convey.
After that he didn't do much celebrity work, he had an appearance in an episode of Star Trek: DS9 and did some less public roles. In recent years he was reported to have sunk into a depression and finally had had enough. He did not make a public cry for attention, it doesn't sound like he made many private calls for help either, he simply decided he'd had enough and he went to a place where he had fond memories to look for peace.
I have no delusions that Walter Koenig reads this blog, or that he ever likely will, but I do want to send a message out to him and his family just the same. I'm sorry for your loss, nothing can ever make right the wrong that has been done here, and I hope you can find the strength to carry on past this.