Andrew Surage of Toronto, a father of five, was shot Oct. 5, 2014, outside an unlicensed after-hours club in the Weston Road and Rogers Road area.
Homicide Det.-Sgt. Graham Gibson said on Tuesday it was related to a robbery.
Surveillance video shows four people getting out of a purple Honda sedan and entering the after-hours club, called Whispers, at the time of the shooting. One of the people police would like to speak to is a female.
Police say the video shows the suspect leave the club and go back to the car to retrieve a gun. When the suspect leaves the parking lot in the vehicle, he almost hits two people walking through the parking lot and hits a parked car before exiting onto Weston Road.
Police say Surage was shot in his chest after he came to the aid of a friend who was being robbed.
Surage came to Canada from St. Lucia many years ago. Police are appealing to witnesses and the persons of interest to come forward and assist in the investigation.