system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel/DC] Have there ever been any major heroes or villains who have died and stayed dead?

Since one of the Battleworld posters, for Years of Future Past, has shown that wolverine most definitely is not going to remain dead for much longer, I was just wondering whether there were any heroes or villains in either universe which never made some form of ridiculous come back?
gpt
Captain Marvel died of cancer back in the 80s; he has stayed dead. (They were acting like he'd been brought back a few years ago, but it turned out to be a Skrull sleeper agent.) 

Also, Jean Grey has stayed dead for a surprisingly long time now - it's been more than a decade since she died in Morrison's New X-Men.