Nobody stays dead in comics. It used to be an expression in comic circles that if something or someone was "as dead as Bucky" then there was no coming back. Then Bucky came back. However, there are exceptions. Some comic book characters have actually stayed dead.
Death in comics is about as permanent as a cold. It's just something you've got to deal with for a little while and eventually it works itself out. At least usually. How many comic book characters have actually stayed dead? There are more than you might think.These are the rare exceptions, the characters who have STAYED dead, at least for now. Enjoy the few, the proud, the actually dead in comic books, may they rest in peace, and cast your votes for the characters whose permanent death is most shocking.
Mar-Vell (Marvel Graphic Novel #1, 1982)
Genis-Vell (Thunderbolts #100, 2006)