i would tp/pm y if i could bring him to a sit and i would ask the story what happend then if it sounded slimier i would ask x for a video because player y could of mugged him in another district.
You can not interact with the player that killed you in the past life while NLR time pases(maybe he raided him and player y had to kill him).Also at the NLR one you can not remember anything from your past life when you respawn and can't interact with the player(s) that killed you in your past life.
Good luck!