Open this photo in gallery Toronto Police have sealed off a large area of Coronation Park, near the CNE's Princes' Gates, after shooting broke out at a barbecue memorializing the 9th anniversary of the shooting of Kamal Hercules. Victor Biro

Toronto police are investigating another fatal shooting in a public place, this time at a park near the Canadian National Exhibition where a memorial picnic was being held to honour a victim of gun violence killed nine years ago.

A man gunned down at Toronto’s Coronation Park on Sunday evening was the fourth person shot to death across the Greater Toronto Area over the last long weekend of the summer, a toll that includes two men killed in separate incidents in Brampton that Peel Regional Police believe are connected.

Toronto police were called to the Coronation Park shooting around 6:15 p.m., after shots rang out near where a barbecue was being held in honour of Kamal Hercules, a 21-year-old slain in a targeted shooting in 2009.

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Toronto police would not confirm whether the shooting took place during the barbecue.

The waterfront park is located across the street from the entrance to the CNE, the city’s biggest and best-known fair, which was celebrating its final weekend.

A man believed to be in his 30s was pronounced dead at the scene, said Constable David Hopkinson, a Toronto police spokesman. It was the city’s 73rd homicide of the year.

The memorial for Mr. Hercules appeared to have been interrupted midstream: Tables beneath a covered picnic area were still festooned with cups and party supplies, while a large sign at the gathering spot reading: “9 annual Memorial BBQ for Kamal Hercules. R.I.P. Kamal ‘Tall up’ Hercules. You’re an Angel in the skies gone but never forgotten. We love & miss you.”

Toronto police are searching for four men seen fleeing the scene, Const. Hopkinson added, one of whom was wearing a grey, hooded, Nike sweatshirt with a black stripe down the middle.

Earlier on Sunday, Toronto police identified a man killed in a shooting in the city’s east end that also sent another man to hospital.

Police say Rudolph Augustus Tyrell, 30, of Toronto died in hospital following a shooting early Sunday morning.

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They say the second man was still in hospital and listed in serious condition as of Sunday afternoon.

Police say they are searching for a male suspect who was wearing a black hooded jacket, black shirt, baseball cap and black pants.

Meanwhile, in Brampton, northwest of Toronto, police say they believe that two separate shootings that left two men dead are related.

Peel Regional Police say two men were shot dead and a woman is injured following the shootings that both happened in the early hours of Sunday morning.

Police say Clifford Correia, 27, of Brampton died in hospital and a woman in her 20s is in life-threatening condition as a result of one of the shootings.

They say Derrick McKeown, 33, from the Georgetown, Ont., area died on the scene of a second shooting.

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Police say they believe these were targeted incidents that they appear to be related to one another.

With files from The Canadian Press