2011 — Holmes enrolls in the Ph.D. neuroscience program at the University of Colorado's Anschutz Medical Campus in the Denver suburb of Aurora. Over the next few weeks, he also buys two handguns, a shotgun, an assault rifle, 6,295 rounds of ammunition and body armor, either in person or online, prosecutors say. Fenton tells a campus police officer Holmes has made homicidal statements and sent her threatening text messages. July 20, 2012 — Holmes slips through a back door of the Century 16 theater in Aurora, where about 420 people are watching a midnight showing of a Batman movie, "The Dark Knight Rises," and opens fire. April 27, 2015 — Prosecutors and defense lawyers are scheduled to make their opening statements.