James Eagan Holmes (born December 13, 1987) is an American mass murderer responsible for the 2012 Aurora theater shooting in which he killed 12 people and injured 70 others (62 directly and eight indirectly) at a Century 16 movie theater on July 20, 2012. He had no known criminal background before the shooting occurred. Before the shooting, Holmes booby-trapped his apartment with explosives, which were defused one day later by a bomb squad.

Holmes was arrested shortly after the shooting and was jailed without bail while awaiting trial. Following this, he was hospitalized after attempting suicide several times while in jail. Holmes entered a plea of not guilty by reason of insanity, which was accepted. His trial began on April 27, 2015. On August 26, 2015, Judge Carlos Samour sentenced Holmes to 12 consecutive life sentences plus 3,318 years without parole after the jury spared Holmes the death penalty by a single vote. In imposing sentence, Judge Samour declared "it is the intention of this court that the defendant never set foot in free society again."