That was never confirmed either way, we were left to assume he died IRL. And I was going for more of a family thing like maybe Sinons pervy friend is the guys lil brother out for revenge, or wouldn't it really be a stretch to say the guy she killed in the robbery was a brother of the guy playing Kuradeel and it just so happens that the younger brother finds both Sinon and Kirito in the same game? Who knows lol, but for some reason Kuradeel has a major part in it, it feels like to me, something beyond LC.