You got the Church part right.

"Michael O Church", who, for some reason, people act as if he's famous or important enough to be identified via an acronym, which isn't true even among HNers...

He was pretty big on HN and Quora before the thugs got him.

The world hasn’t forgotten. He’s a big part of the reason why no one believes in tech anymore.

Dunno, had to look him up, and I've been on HN for 15 years or close...

He’s gone quiet of late, but his karma count was well into the 5 digits before he got shot in the back of the head.

He was too flashy about his intellect and got used as an example. That was his big mistake.