The mother of a Toronto man fatally shot earlier this month while he was working as a security guard for an illegal marijuana dispensary during a "robbery gone bad" pleaded on Tuesday for information on two remaining suspects.

A homicide detective also released surveillance camera video obtained from the industrial plaza where the killing occurred. A man and a teen boy have been arrested and charged.

Dwayne McMillan, 44, a father of four boys, was gunned down in the plaza's parking lot at Keele Street and Steeles Avenue West, near York University, on the evening of Oct. 2, according to Toronto police.

Sandra Cooke, McMillan's mother, said her son's death has shattered her family, leaving a void that cannot be filled. McMillan was not only a son, but a father, partner and brother, she added. His boys are 25, 14, and two are 13 years of age.

"I think that anyone who can take someone's life without any regard, like this, would not be the type of person to take ownership for their actions and be held accountable. But as a human, to whoever killed my son, I am appealing to you and your conscience," Cooke said.

'Please give us closure'

"I want someone to look at my family and say that they are sorry for their actions."

Cooke also asked members of the public, including the mothers of the killers as well as their associates, to help the police in its investigation. The two remaining alleged killers should be turned in to the police, she said.

"This could be your grieving family up here. If you know anything, come forward and please give us closure."

Cooke said she believes justice will be done.

"He's dead. He died protecting someone. He would fight his last fight just to make sure you were okay. He was doing a job. He is not going to come home," she said. "But somebody will pay."

Dwayne McMillan, 44, was shot in a North York industrial plaza near York University on Oct. 2, Toronto police say. (Toronto Police Service)

Cooke explained her son knew his job was not safe, and said that worried her. Police said the marijuana dispensary was located within the plaza. He had planned to change his life, including going back to school, she added.

"I have spoken to him many, many times. He always say: 'It's a job like any other job.' I was worried about this job. But my son is a big guy and everybody loves him," she said.

Her concern was that he was working for a company selling "drugs."

Police were called to the scene at about 9:35 p.m. Emergency crews found McMillan suffering from "obvious signs of trauma" immediately after the shooting.

Toronto paramedics performed CPR, but he was pronounced dead at the scene. His death is the city's 82nd homicide of 2018.

2 charged with murder, arson to property

Homicide Det. Paul Worden said police are hoping members of the public can help officers identify the two remaining alleged killers.

Toronto police vehicles are parked near the scene of the city's 82nd homicide of the year on Oct. 2. (CBC)

"We really have no leads into who they are right now," Worden said.

"Anyone who would casually shoot an individual and leave him there is a danger to society," he said. "We'd like to get these other two suspects off the street."

Last week, officers charged a 19-year-old, and a 16-year-old, with second-degree murder and with arson to property in the killing. The pair are not talking to police, he added.

About 24 hours after the homicide, officers found what they believe is the getaway vehicle near Jane Street and Sheppard Avenue West. It was on fire.

Police displayed two rifles and ammunition seized during the arrest last Thursday, and released the security camera footage, which shows all four alleged killers before and after McMillan was shot. Faces of the two in custody are blurred in the video.

Toronto police displayed two rifles seized during the arrest of a man and a teen boy in connection with the killing. (Paul Smith/CBC)

Worden said of the weapons: "They're meant to kill. They're used to create maximum damage."

Police believe the males had some connection to the dispensary but they were not able to enter the premises. McMillan confronted them when they tried ot enter, he said.

"They never got into the premises. Mr. McMillan did his job."

The video shows two males approaching the entrance to the dispensary and one knocks on the door. McMillan opens the door, one male pulls out a handgun, and the males struggle with the victim. Two other males come running up to help the first two. Then they all flee the scene.

Early in the video, one of the outstanding suspects leans against a wall, holding a handgun. He was wearing a Puma track top and a jacket with a hood. The other outstanding suspect is one of the two who comes running. Both are wearing footwear that is "distinct in its pattern," Worden said.

Homicide Det. Paul Worden says: 'Anyone who would casually shoot an individual and leave him there is a danger to society. We'd like to get these other two suspects off the street.' (CBC)

The man and teen boy who have been charged were both scheduled to appear in a Toronto court last Friday.

'My grandchildren no longer have a father'

Cooke said she feels sympathy for all four men involved in the killing because they need professional help and she doesn't want to be angry.

"You have to feel sorry for them. These young people have no respect. A life has become nothing," she said. "It hurts. My grandchildren no longer have a father."