There is no proof that Lapu- Lapu killed Magellan. Actually, according to my research, he was attacked by random natives. He was hit in the arm by a bamboo spear and got wounded on the left leg. There is no name of the natives who hit and wounded him. Lapu- Lapu only led the revolt. 

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Lapu-lapu was killed by Magellan.
ღBut the thing i know he died because of the ''Battle againts the Raiders''
Hope it helps~~^^~~