system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel/DC Comics]Has a major hero or villain ever really, truly died and never come back in any incarnation?

Heros and villains die all the time. But it seems like it always turns out that it was their long lost brother, or a robot, or it just *looked* like they died, or someone they inspired replaces them, or someone uses a godlike power to revive them, etc. Has any important hero or villain ever really and truly died and never come back in any form? Events happening in alternate realities notwithstanding, of course.

Edit: I should specify, omit characters that have died recently, say within the last couple of years, as they may not have been resurrected yet but are likely to be in the future.
gpt
Ted Kord, Jonah Hex, Eric Masterson, Doctor Light, Skurge the Executioner, a good chunk of the original JSA (Johnny Thunder, Doctor Mid-Nite, Mr. Terrific, the Sandman, Starman, the Atom), Johnny Quick, Max Mercury, the Phantom Lady, Pantha, Wildebeest, Kid Devil, Richard Fisk, Emperor Vulcan, Charles Xavier, Madelyne Pryor, Lian Harper, Uncle Ben, Captain Mar-Vell, Genis-Vell, Omega Red, Adeline Kane, Wade deFarge, Tommy Monagahn, Brainiac 8, Terra...

I could go on for a while, man.