I just saw this last night. Yesterday, I almost posted a thread called "Where's Killing Floor?" because I was sincerely wondering why i haven't seen him around. He was far and away my favorite poster on here, just a witty, insightful guy. I would click on the goofiest questions people post, and sure enough, he always had something fun to say in the thread. I could tell he had some wisdom and never forgot what was important about music.
Never met him, and didn't even know his name was Steve, but It was clear there was an insightful, charming, and three-dimensional person behind that little red headstock icon. I'm genuinely sad to hear this, and I'm sorry for your loss. Your dad absolutely made this forum way way more fun.
-S