The Peter Parker of Earth-8351, or also known as Assassin Spider-man, was trained by Wolverine to be a killer after the death of Gwen Stacy. Peter realized his loved ones would always be in danger from his enemies, and he decided that in a war he should start eliminating enemies for good.
He was attacked by Karn the Inheritor, who easily killed Wolverine with his weapon. Assassin Spider-man was saved from this fate by Superior Spider-man in order to recruit him to his Spider-army.
From – Superior Spider-man #32