:^O well moon, her heart was in the right place.

I don't think Cook killed any aboriginals, but he was killed by some in Hawaii

Initially relations between the Europeans and the Hawaiians were friendly and peaceful. The genial atmosphere broke down after a series of thefts from the European stores. Tensions came to a head on the night of the 13-14 February, 1779 when the Discovery’s cutter boat was stolen. On the morning of the 14th of February, Cook, Lieutenant Molesworth Phillips and nine marines went ashore and attempted to take hostage Terreeoboo, the Hawaiian King.

This strategy of Cook’s intended to force the Hawaiians to return the cutter. However in the confusion, shots were fired and one of the high-ranking chiefs, Kalimu, was killed. At that point, the crowds on the shore responded in anger. As Cook and the marines returned to their boats, they were attacked on the beach. Cook fired his gun and killed a Hawaiian warrior. In return, he was struck on the head by a club and speared by an iron dagger. Falling into the water, he was not seen alive again.

That's a bit of a cliff hanger isn't it.  Today conspiracy theorists would wonder if he survived and managed to escape to return to England :^O