On August 1st, 1966, former Marine Charles Whitman climbed to the top of the University of Texas clock tower and, over the course of 96 harrowing minutes, carried out what was then the deadliest mass shooting by a lone gunman in U.S. history.

In this episode, we examine the events that led to the tragedy, the psychological and personal factors behind Whitman’s actions, and the lasting impact this shocking event had on the U.S., from law enforcement response to the national conversation around mental health and gun violence.