Final answer:
Captain James Cook discovered the Hawaiian Islands during his third Pacific voyage in 1778. He was not killed by the natives in Hawaii, but rather in a dispute with the native population of the island of Hawaii in 1779.
Step-by-step explanation:
The person who discovered the Hawaiian Islands was Captain James Cook, an English explorer. He arrived in Hawaii in 1778 during his third Pacific voyage. However, Cook was not killed by the natives of Hawaii. Rather, he was killed in 1779 in a dispute with the native population of the island of Hawaii.