Contender suicide?

I was watching Leno last night, and Stallone was on the show.
He talked about a bunch of crap, and then out of nowhere Leno rings up the fact that one of the fighters killed themselves.
Stallone said "yeah, it was **** (couldn't make out who he said), I got the call 3 months after the show and I guess he'd taken his own life."

Anyone know who it was and why it happened?
I know they said they'd show him exactly the way he was, wouldn't edit it or anything... and he had a wife and child.

Najai Turpin,1,15960,00.html

damn...that sucks.

Judging from the previews for the next episode, I think he's fighting next.