candidate: In July 20 , 2012 , not far from the location of the aforementioned massacre at Columbine High School , 12 people were killed and 70 people were injured in the 2012 Aurora shooting , when James Eagan Holmes , a former neuroscience doctoral student , walked into an Aurora , Colorado Cinemark movie theater with three different guns and started shooting at random at people trying to escape , during a midnight Thursday showing of " The Dark Knight Rises " .