24-year-old James Holmes purchased a ticket to see the midnight screening of The Dark Knight Rises in a movie theater in Aurora, CO. Upon entering the theater, Holmes propped up an emergency exit before leaving the theater to get three of four guns he had in his car along with two cans of tear gas. After the gas went off, Holmes waiting until people starting running for the door before spraying the theater with bullets leaving 12 dead and 59 others injured in the biggest mass shooting in American history.