Louis Levi Oakes, the last of the Mohawk code talkers, who helped American soldiers triumph in the Pacific Theater during World War II, along with code talkers from other tribes, died on May 28 at a care facility near his home on the Akwesasne Mohawk Reservation in Quebec. He was 94.

The death was confirmed by his granddaughter Teresa Oakes.

The code talkers, a group of several hundred soldiers, used their indigenous languages to create impenetrable ciphers as a way of securely relaying vital information on the battlefield. Most of them were Navajos, more than 400 of whom participated in an extensive Marine Corps program.

But code talkers from other tribes, including the Hopi, Comanche and Mohawk, also played a role. Mr. Oakes was one of about 24 from the Mohawk tribe, whose lands are mostly in upstate New York and Canada.

David A. Hatch, the National Security Agency’s senior historian, said in an interview on Tuesday that about 30 indigenous languages were used in battle and that about 10, including Mohawk, became the basis for more complicated codes, in which traditional words or phrases became metaphors for matériel. The word for “turtle,” for instance, might be used for tank.