#6: Jean Grey (Uncanny X-Men #137)
Jean Grey has died more times than Jennifer Aniston has had box office flops. But her death as the Dark Phoenix in Uncanny X-Men #137 is easily the most memorable. Charged with casual genocide by an intergalactic race, Jean faced execution by the hands of the Shi’ar Empire. While the X-Men fought to save Jean’s life, she decided to take matters into her own hands and kill herself in order to save her friends from battle and also to atone for her sins. Then, of course, she got resurrected more times than a NASA supercomputer can count.