Emergency crews responded to calls for assistance at Guindon Park in Cornwall early Saturday evening.
Police say Earle had been scuba diving in the river and was brought to shore unconscious by firefighters and bystanders.
Earle was transported to Cornwall Community Hospital by paramedics and was later pronounced dead by hospital staff.
Police say the cause of death is not known yet known but no foul play is suspected.
An autopsy has been scheduled to determine the cause of death and the coroner's office is investigating.
Earle was the Liberal candidate in last year's election in the provincial riding of Stormont-Dundas-South Glengarry, which is currently held by the Conservatives.
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