The diver who died in Portland Harbor this week suffered injuries consistent with being hit by a spinning propeller, authorities said.

Dennis McGrath, 56, of Scarborough died Wednesday while removing rope that was tangled on the prop of the 65-foot fishing boat Jamie & Ashley. While he was working, the engine was running and at some point, the prop was engaged, injuring him, authorities said.

The state medical examiner did not release a cause of death, saying it is pending further study to rule out natural causes.

Police say the investigation into the death continues and they have reached no conclusion about exactly what happened, but they believe the incident was not intentional.

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