Doctor Octopus

Death threats to writer Dan Slott
Spidey

Peter Parker has just been bumped off in the 700th Anniversary issue of Spider-Man. In a body-swap storyline, Peter Parker's mind finds itself trapped in Doc Ock's dying body which only has a few hours of life left init. He fails to reverse the swap, dying in Ock's body with Doc Ock's mind now inhabiting the body of Peter Parker/Spider-Man. Parkers memories over-ride Doc Ocks villainous side though, creating what is more like a merger of the two characters and giving the writers the back door they need to bring Parker back to life when they so wish.

And given the spate of comic book deaths and resurrections in recent years, you can guarantee this is only a matter of time.