PORT CLYDE – A Florida man whose body washed ashore Saturday off Marshall Point Lighthouse died of drowning, with significant blunt trauma to the head, according to the state medical examiner’s office on Monday.

It is unclear if Robert Curtis Conklin, 63, of Jacksonville, Fla., hit his head before or after falling into the water. Conklin’s 24-foot sailboat Bucephalus may have hit ledge and the sail boom swung, hitting him in the head and knocking him overboard.

“We may never know what exactly happened,” Maine Marine Patrol Officer Brian Tolman said Monday.

The immediate cause of Conklin’s death was “drowning,” according to a spokeswoman for the medical examiner on Monday. He also suffered “blunt impact head trauma,” she said.

The vessel and Conklin’s body were discovered nearly two hours of each other early Saturday morning. The boat was spotted just before 6 a.m. Around 7:50 a.m., Conklin’s body was found.

“We’re treating it just as an accident,” Marine Patrol Lt. Alan Talbot said Monday.

Conklin was not wearing a life jacket, Tolman said, but he was wearing a CO2 jacket, which is a vest that inflates by pulling a cord. The vest had not deployed, but was operable, he said.

Officials believe Conklin was sailing from Port Clyde to Kittery, where he was planning to have his sailboat hauled out of the water. Witnesses saw Conklin leaving Port Clyde between 2:30 and 3 p.m. Friday. A fisherman noticed him near Allen Island just south of Port Clyde about that time.

Conklin was an avid sailor who was known to sail at night, Tolman said.

It appears by the damage to the sailboat that it ran aground or was on ledge somewhere, Tolman said, noting the keel was torn off and there were many scratches on the hull’s bottom.

The sailboat had a hollow keel that may have left some material from the inner hull on a ledge. When the wind tapers, investigators plan to look at low tide around Old Man Ledge and Hart’s Island Bar for signs of a grounding, he said.