A man who had to be pulled out of Lake Ontario by police following a recreational diving expedition in Oakville has died.

The incident happened Wednesday afternoon off the shores of Bronte Harbour.

The man's identity has not been released. A post-mortem will be conducted Thursday.

Staff Sgt. Michael Brown of the Halton Regional Police Service said three men were on a boat preparing for a scuba diving expedition when police received a distress signal around 3:30 p.m. ET.

Members of the police's marine unit found two divers in the water, one without vital signs, he said.

They were transferred to Oakville Trafalgar Memorial Hospital, where one died and the other is in fair condition, Brown said. The other man, who had called police, was not hurt.

Brown did not provide further details, including the nature of the victim's injuries.

Halton police are still investigating.