 We learned that Crooks often used his dad's rifle at the gun range for target practice. The day of the assassination attempt, when Crooks asked to borrow that gun, his father didn't think it was unusual and let him have it. That's according to ABC News. Investigators are now trying to unlock Crooks' phone. They're hoping to find out if any of the media that he had been consuming may have played a role in the attack. As of now, investigators have not determined a motive.