Was it a Republican operative or one of the Wall Street titans he toppled or maybe the Gambino Family? Sounds like he had enemies standing in line waiting for him to do something stupid, and once he fell (or was lured) into the prostitution trap, he did just that.
Once he was paying for prostitution with large cash transactions that must automatically be reported by banks, he, IMO, was doomed. His recklessness in calling up the bank asking to have his name taken off the transactions sealed his fate. Why he was so desperate and stupid is what remains unanswered.