I know it's pretty early in the series to be talking about this, but I have this image in my head for how Katsuki Bakugo is going to die. Katsuki Bakugo will be killed in battle against a Tomura Shgaraki who by that point will have inherited All for One's quirk.
Katsuki Bakugo's death will parallel Izuku at the end of their first clash in the Battle Trial. Katsuki Bakugo will essentially sacrifice himself in order to defeat his enemy. "Didn't All for One ever teach you that you can lose the battle and win the war? That's the first thing I ever learned at My Hero Academia." Katsuki Bakugo's final words will be "I win" and he will fall over dead with a smirk on his face.