6. James Eagan Holmes
Length of sentence: 12 life sentences + 3,318 years
James Eagan Holmes was found guilty of killing 12 and injuring 70 people in a shooting in a Colorado theater on July 20, 2012. He bought a ticket for the screening of “The Dark Night Rises” and took the front row seat. Soon after, he tossed a tear gas grenade and opened fire. He received one life term for each person he killed and additional 3,318 years for attempted murders of all the people he wounded. He rigged his apartment with explosives as well, which he was also convicted for. James Eagan Holmes will definitely not be setting foot outside of prison since he is not eligible for parole. While this sentence sounds like a lengthy one, remember that we are only half way through our list of 11 longest prison sentences in the world.