Windsor police returned to the scene of last week's shooting in downtown Windsor over the weekend.
Matthew Mahoney was shot and killed in the early morning hours Wednesday outside the McDonald's on Wyandotte St. E. at Goyeau St. after pulling a knife out of a butcher block and advancing towards an officer.
According to witness reports Mahoney was shot as a last resort after a Taser failed to stop him.
A large portion of the McDonald's parking-lot and the drive-through was taped off while an officer surveyed the area with a metal detector Sunday.
Police would only confirm they were there as part of a parallel investigation related to the incident.
The Special Investigations Unit is still leading the probe into the shooting.