>> j. edgar hoover said back in '69 that they had had regular contact with jack ruby. >> david kaiser is a historian and author of "the road to dallas." >> he couldn't make the payoff. he was looking for help wherever he could get it. >> jack ruby made calls to individuals associated with organized crime. >> the report about ruby's sister, ruby got a phone call right at this time and went in the other room and threw up. maybe he got a phone call that said, ruby, we need you to do something for us. >> but mark lane insists the cia had the means and the motive to kill kennedy. >> the cia decided better him than us and killed him. >> following the disastrous attempt to topple castro in the bay of pigs invasion, the president was furious with the cia. >> this was a struggle of cuban patriots. >> castro's troops outnumbered the cia-backed operation.