Lapu lapu died because, of tetanus from the sword used to attack him and tuberculosis because he never wear clothes :3

just kidding Lapu lapu is killed by Magellan's men.
Lapu-Lapu was not killed by Magellan's men. They even celebrated it. There are many theories based on the death of Lapu-Lapu. Some historians claimed that Lapu-Lapu died because of old age. By the way, Lapu-Lapu died in 1524.
Hahahaha XD Nice Levi XD
He died because he was attacked by a poisoned weapon of Spanish or somehow forceful pull when his hands and legs were tied to four horses by his enemies or allies.

Hope it helped :)