KITCHENER - Emergency crews were called to Kaufman Flats park off University Avenue in Waterloo around 4:30 p.m. Tuesday.
According to police, first responders were called to the area for a medical call.
Just before 6 p.m., police said in a tweet that they were on scene for a body found in the river.
The Waterloo Fire Department says that the call initially came in as a possible rescue.
Police say that the incident is not considered suspicious but have not yet determined what caused the person to die.
Officers tell CTV that the victim was a man in his 50s or 60s but have not yet released his name.