Investigators with Alberta's Serious Incident Response Team are looking for the occupants of what is believed to be a silver vehicle photographed at the scene of a shooting on Deerfoot Trail in late February. 

Occupants of the other vehicles in the photograph have already come forward and police say their assistance has been invaluable in the investigation.

The shooting occurred on Feb. 28 when officers caught up with an erratically driven stolen vehicle on Deerfoot Trail near McKenzie Lake Boulevard S.E.

Police shot and killed Jason Roy, 34, when the driver — boxed in by police cruisers — tried to ram the officers with the stolen vehicle.

Ashley Silver, 26, who was with Roy in the vehicle, was also critically injured.

Police were initially acting on reports of shots being fired in the nearby 1400 block of Copperfield Boulevard S.E. and followed the suspicious vehicle to the southbound lanes of Deerfoot Trail.

The Alberta Serious Incident Response Team (ASIRT) is asking the occupants of the silver vehicle or anyone able to identify them to call 403-592-4306.