Ferdinand: Another year doxycycline tetracycline conversion Holmes, 25, has pleaded not guilty by reason of insanity to killing 12 people and injuring 70 others during a shooting spree at a movie theater in Aurora on July 20, 2012. During a hearing on Monday to determine what evidence prosecutors can use in the case against the former neuroscience major, it was revealed that Holmes established profiles on two dating websites prior to the shootings.