::::::True as it is that the FBI and other agencies were making his life more difficult, the gunman just sat there and read.  He shot him and sat down, he was apprehended and confessed without a fuss.  Why would a man serve 20-to-life for some minor grudge with his politics?  I remain pretty convinced this guy was a loon, now I don't know if he was somehow pushed or encouraged to go this route but without some amazing new information I've got to conclude that John was murdered by a fan in the truest since, a fanatic.