Ant-Man and the Wasp: Quantumania shockingly almost killed Hank Pym and made him come back to life through ants. The trilogy finale for the Ant-Man franchise in the Marvel Cinematic Universe saw all the members of Scott Lang's family survive the trial that was the great fight against Jonathan Majors' Kang the Conqueror in the Quantum Realm. While only Kang seemed to die in the movie, there was originally a big death planned for the Ant-Man family, with Michael Douglas' Hank Pym biting the dust, although he would have lived on in a very weird way.
https://screenrant.com/ant-man-wasp-quantumania-hank-pym-death-ants/