There have been several characters who've managed to defeat Kang the Conqueror at different points. One of them is Captain America in a particular storyline.
It's a complex situation. Different storylines might have different killers of Kang the Conqueror. Sometimes it's a team effort, and other times it's an individual with a specific motive.
One of the great Kang the Conqueror stories is his origin story. It shows how he became this powerful, time - traveling villain. His rise from a normal man in a post - apocalyptic future to a conqueror is really captivating.
It's a complex storyline. Different comic story arcs have different scenarios regarding Kang's death, and it's not attributed to a single character consistently.
Kang is a major antagonist. He has advanced technology and the ability to traverse different eras. His goal often involves ruling and reshaping the universe to his liking.