Jack Ruby changed history with one bold, violent action: killing accused presidential assassin Lee Harvey Oswald on live TV two days after the November 22, 1963, murder of President John F. Kennedy. But who was Jack Ruby, and how did he come to be in that spot on that day? As we approach the sixtieth anniversaries of the murders of Kennedy and Oswald, Jack Ruby’s motives are as maddeningly ambiguous today as they were the day that he pulled the trigger. The fascinating yet frustrating thing about Ruby is that there is evidence to paint him as at least two different people. Much of his...