After the events of the Gifted storyline, Wing's depression over his loss of his mutant powers is hitting its peak and the X-Men venture off to fight a monster in New York. Despite being in the Fantastic Four's territory, the X-Men manage to bring the giant monster down with the Four's help.
Meanwhile, back at the X-Mansion, Wing is encouraged by Hisako to jump from the cliff because of his lost powers. She nudges him closer and closer to suicide until he finally leaps, breaking his neck and dying nearly instantly. It's revealed that he was in the Danger Room alone, and not with Hisako outside.