Det Ch Insp Phil Clarke, who is leading the investigation, said: “The black Kia Niro was distinctive as it was a hybrid electric vehicle with unique alloys.
“Did you see it that night at any point, or in the days before the shooting?
“What you know, however insignificant it may seem now, could hold the key to this investigation.”
There have been no arrests so far and police said while some cordons at the scene of the shooting have now been lifted, others will remain in place for the time being as detectives continue to look for evidence.