A 16-year-old Canadian involved in a helicopter crash in Hawaii's Pearl Harbor last week has died, according to U.S. authorities.

The teen and three of his family members were admitted to the Pali Momi Medical Center in West O'ahu after the incident on Thursday.

"It is with a heavy heart that we announce that the 16-year-old involved in Thursday’s helicopter crash was pronounced dead today at Pali Momi Medical Center," said a statement from the hospital's CEO Gidget Ruscetta.

"So that the 16-year-old’s memory lives on, the family has chosen to donate his organs to patients in need."

In the statement, the hospital said two of his family members remain in stable condition, while a third was treated at another local hospital and released.

A U.S. Navy spokesperson identified the family members who are in still in hospital last week as a 45-year-old woman and a 50-year-old man.

The Department of Global Affairs told CTV News it is are aware of the incident involving Canadian citizens and is providing consular services to the affected individuals.

It added it cannot release further details because of the Privacy Act.

The dramatic crash was caught on video, showing the helicopter abruptly tilt to its side before slamming into the sea.

The 16-year-old was trapped underwater and had to be cut from his seat.

Bystanders at the nearby Pearl Harbor visitor centre were quick to offer their help, with several diving into the ocean.

Few details are known about the pilot's condition.