A fatal boat crash off Nantasket Beach on Saturday is being investigated by Cohasset police, with police divers investigating the area near Dock’s Island off Black Rock Beach, the department said in a statement on Thursday.

On Aug. 9, the Massachusetts State Police Marine Unit and U.S. Coast Guard responded to the beach to investigate a report of a capsized boat around noon, Plymouth County District Attorney Tim Cruz’s office said in a statement.

Investigators soon found Michael LaRhette, 56, of Hingham, in the water and unresponsive, Cruz’s office said. He was taken by boat to a Coast Guard station, where he was pronounced dead.

The crash was determined to have happened within Cohasset’s “coastal jurisdictional waters,” police said Thursday. Cohasset police detectives and the dep

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