The Boston Globe newspaper reported that police believed the death was a suicide and the deceased was a man between the age of 28-30.
The Boston Red Sox baseball team, that Henry also owns, confirmed the news in a statement.
"Earlier today, a crew member on the vessel, M/Y (motor yacht) Iroquois, apparently took his life aboard the vessel docked at 30 Rowes Wharf," it read.
"Mr. Henry and the members of the Boston Red Sox are saddened by the news and send deepest condolences to his family. Apparently only crew members were on board the vessel when the incident occurred."
The Boston Globe reported details of the incident: "Boston police spokeswoman Cheryl Fiandaca said firefighters and police responded to the Iroquois for a medical emergency about noon," the paper reported.
"Fiandaca said they found a 28-to-30-year-old male in cardiac arrest. Efforts were made to revive the man, but he was later pronounced dead.
"Fiandaca said the man may have been working aboard the 164-foot-long vessel, which was docked at 30 Rowes Wharf, behind the Boston Harbor Hotel. In 2011, Henry sought to sell the yacht for $28 million"
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