Here are some notable instances:
* "Death of X" (2016): In this event, Cyclops was seemingly killed by the Inhumans' Terrigen mist, but he was later revealed to be alive and trapped in another dimension. He was eventually rescued and restored to his normal state.
* "Age of X" (2011): In this alternate timeline, Cyclops died as a hero fighting alongside the X-Men against the "Sentinels." However, this is just a different reality, and it did not affect the main Marvel Universe continuity.
* "X-Men: The Last Stand" (2006): In the movie adaptation, Cyclops was killed by Jean Grey, but this version does not represent the comic book continuity.
While Cyclops has faced several threats and near-death experiences, he has always found a way to survive in the main Marvel Universe.
However, it's worth noting that the future of the X-Men franchise is uncertain, and the death of a character is always a possibility in comics.