Article continues below advertisementCharlie Kirk's assassin chose a spot on the rooftop to fire off his shot from in order to make a quick escape, according to an FBI expert.The shot was fired from the top of the Losee Center Building at Utah Valley University, approximately 200 yards from where Kirk was seated and talking to 3,000 people. The area of the rooftop the sniper was on allowed them to get "miles and miles away" in minutes.