York Regional Police are investigating after a man was found without vital signs at the side of the road.
He was later pronounced dead in hospital.
York Regional Police Constable Andy Pattenden says they believe the man was 50 years old.
He says the man was spotted by a passerby on Old Kennedy Road north of Steeles at around 5:40 Monday morning.
The man was rushed to hospital with, "some kind of injury that we do believe is consistent with a weapon being involved."
Old Kennedy Road will remain closed as police investigate.
York Regional Police are asking anyone with information or video footage of the scene to contact Homicide detectives.