He wanted to be Jax Pavan 230,419, because that was his birthday. But another Jax Pavan had already taken that name, so Jax Pavan 220,419 decided to kill Jax Pavan 230,419 out of frustration. Actually, Jax Pavan 220,419 had been a nice guy, but life had been a series of failures. Can't hold down a job, can't get a girlfriend, tries to do something good only to meet abject failure brought about by circumstance. You know the drill. Sometimes he felt, if he only had someone to say "I love you" to him, he'd make it through the day. The name thing was just the final straw to make him snap.
So one night, he snuck out of his home and into Jax Pavan 230,419's under the cover of dark, and killed him in his sleep. Snapping out of his breakdown, and seeing the blood on his hands, Jax Pavan 220,419 couldn't live with himself and committed suicide. Oh Well.