Waterloo Regional Police investigators have closed a street in Kitchener, Ont., as they investigate the "suspicious" death of a man killed with an arrow this morning.

Late Monday afternoon, police identified Michael F. Gibbon, 60, as the victim.

Officers responded to a call around 7 a.m. on Monday about a man who had sustained life-threatening injuries from an arrow in the Margaret Avenue and Union Street area. The man was taken to hospital, where he later died.

Margaret Avenue has been closed between Hartwood Avenue and Union Street.

Two houses are involved in the investigation — 387 Margaret Ave. and 430 Guelph St. — which are about three blocks apart.

A neighbour living three houses away from the Margaret Avenue home where the wounded man was discovered in the front yard said another neighbour came upon the man while out walking his dog.

Blair Wendell, who lives across the street from the house, said he got up around 7:15 and saw the man being treated by emergency medical responders.

"There was a man being taken away on a stretcher who appeared to be alive at the time, because someone was holding his hand," said Wendell. "At the time we thought it was a medical issue and didn't think anything of it."

Wendell said he didn't see an arrow.

"We don't have anybody in custody right now — we're still investigating," said Staff Sgt. Mike Haffner. "We want people to be aware of their surroundings and vigilant to the situation, but more importantly if they observe anything suspicious, or anything out of the ordinary, to call police."

Haffner also said police will set up a command post in the neighbourhood and will canvass the area to try to get more information.

Neighbours said the man's body was found on the lawn at this house at 387 Margaret Ave. It was spotted in the front corner of the yard by a man out walking his dog. (Amanda Grant/CBC)

Breithaupt Park, Margaret Avenue and Union Street area will see an increased police presence as the investigation continues.

'Hold and secure' lifted for all schools.

Twelve schools in the area were under hold and secure orders during the day, with the last of the orders lifted just after 2 p.m., according to John Shewchuck, the chief managing officer of the Waterloo Region Catholic District School Board.

'All of our students and staff are safe.' - Lynsey Meikle, spokeswoman for Waterloo Region District School Board

"Hold and secure means it is business as usual inside the school, just the front doors are locked and no one is allowed in or out of the building," said Lynsey Meikle, a spokeswoman for the Waterloo Region District School Board.

"All of our students and staff are safe and we'll be updating parents via our Twitter feed as soon as information becomes available."

Where the houses are located:

On mobile? See a map of the house locations here.