Source: dailydot.com

9. Black Widow

Two Deaths: Avengers #177 and Secret Empire #7

And here we have our first main Avenger.

Natasha has actually died very few times for a comic book character. It's weird. Her first-ever death came at Korvac’s hands during his titular saga. She was blasted in the chest and died on the spot, although this death was pretty much immediately undone.

Her second death occurred during the Marvel Comics event Secret Empire. In this story, Steve Rogers had his personal reality re-written to make him into a HYDRA sleeper agent. Natasha was a leader of the superhero resistance, and she fought him tooth and nail. But in the end, she wound up stepping between Steve’s shield and Miles Morales, aka Spider-Man. The shield struck her in the neck, and killed her.

Buuuut again, while I haven't been reading Tales of Suspense, it appears that she's probably making her return over there as we speak.