Career
On June 15, 1924 Brennan was shot to death by two "street thugs" in New New York According to Jack Dempsey, Brennan had opened a speakeasy, and some men informed Brennan that he was buying the wrong mob"s beer. Brennan is said to have forcibly ejected these mentor
But on the night of June 15, he was summoned outside by another man he did not know where a gunman was waiting who then pulled his gun and shot Brennan.
