A 61-year-old man has died after a fishing accident at Parc des Rapides in Montreal's LaSalle borough, in the south-west part of town.

The man was fishing in water up to his knees when he fell into the water and was swept away by the strong current.

Montreal police Const. Olivier Lapointe said witnesses jumped in to save the man.

"We know for sure that he fell into the water but we don't know if he lost footing or if he had some kind of heart attack," said Lapointe.

"But he fell into the water and four witnesses jumped in to help him," Lapointe said.

The man was pronounced dead in hospital.

An autopsy will be performed Thursday to determine whether the man drowned or if a pre-existing heart condition contributed to his death.

The four people who tried to rescue the man were not injured.