Aug 1st
Former Eagle Scout and United States Marine Charles Whitman carries a sniper rifle onto University of Texas at Austin. There he climbs to the top of UT tower and begins firing indiscriminately at dozens of people, killing 13. Whitman is finally taken out 96 minutes later by three Austin PD officers.
July 31st
The San Francisco Chronicle, the Examiner, and the Vallejo Times-Herald receive nearly identical letters from the Zodiac Killer. Specific details are given about recent murder scenes, along with the demand that a "cipher" be printed on on the front page of the papers (or else Zodiac will go on a "ram-Page").