well according to tv today the mafia killed him, the cia killed him, castro killed him, lbj killed him. maybe they all worked together to kill him. i guess the conspiracy story makes good tv.
Likeliest but overlooked answer: the Soviet KGB had Kennedy killed for making monkeys out of the Soviets when they were made to back down over their Cuba nuclear missiles bullsh*t. Remember the assassinated suspect killer had been to Russia. Am I right or am I right?