A man's body was pulled from the water off the coast of Quincy, Massachusetts.
The victim was identified as 32-year-old Jesse Loubier of California.
Witnesses on the boat said Loubier entered the water on purpose to dive down and free the boat from a line in which it had become entangled. He surfaced after his initial dive and reported being unsuccessful in freeing the boat from the line. He was said to have then gone down again to continue his effort and did not come back.
The official cause of death will be determined after a medical examination.
There does not appear to be any foul play associated with the death.
Loubier went overboard in Town River Bay. He was visiting family in Quincy.