On Monday, March 5, 2001 at 9:20 a.m., 15-year-old Williams entered a boys' bathroom at Santana High School with a loaded 8-shot .22-caliber revolver taken from his father's locked gun cabinet and fatally shot a freshman. He then left the bathroom and began firing the revolver indiscriminately at other students, killing another. According to one witness, Williams repeatedly walked out of the bathroom, fired shots, then went back into the bathroom. The scene soon turned chaotic as students and teachers ducked or scrambled to safety. Minutes later, the school was on lockdown. Williams reloaded his revolver at least once. A student teacher, Tim Estes, and Campus Security Supervisor, Peter Ruiz, walked into the bathroom to investigate what Ruiz thought may be the sound of firecrackers. Upon entering the restroom, Ruiz was shot once in the shoulder by Williams. As Estes and Ruiz turned to run, Ruiz was hit in the back by two more bullets and Estes was hit in the back by a bullet which exited through his abdomen.