sorry to here that shit man ,i always told my son that if he didnt no the person dont let them into the party,of course he thought i was full of shit .a couple years ago he had his car in the shop and one guy that showed up with a girl he knew,thought he wasn't home broke threw the door to find my son standing there with a pistol i gave him for his birthday .moral of story it was defitnely some one you knew or some one your freind knew