 Authorities say he was killed by Secret Service agents moments after he opened fire. Authorities are still trying to find out why he did it. NPR's Ryan Lucas confirmed Crooks was a member of a shooting range near his home. He has more on what authorities have turned up so far. There are two key pieces of evidence that they have recovered that they're working on, the alleged shooter's gun and his cell phone. Both have been sent to the FBI lab in Quantico, Virginia, for analysis. The FBI says the gun was purchased legally, it believes, by the shooter's father.