Cobb County police said Tuesday they have narrowed their search for the vehicle involved in a fatal hit-and-run motorcycle crash over the weekend.

Police are looking for a gray or silver 1986 to 1991 model year Porsche 944.

Investigators were able to zero in on the make of the car from evidence recovered at the accident scene and the assistance of the manufacturer. The search also continues for the driver of the Porsche.

Police say Emanuel R. Mitchell of Norcross, a 31-year-old riding a black 1990 Kawasaki Vulcan motorcycle,  died after being struck around 8:30 p.m. Saturday by two vehicles on I-75 in the southbound lanes near Windy Hill Road.

Mitchell died at the scene, police spokesman Dana Pierce said.

Sonni Smith, 23, of Atlanta, told police her Mazda 3 struck Mitchell after the driver of a silver Porsche driver made initial contact with his motorcycle. Smith, who will not be charged, said the Porsche driver fled.

Police previously said they were looking for a Porsche coupe with tinted windows and moderate damage to the left front of the car. Anyone who has information about the accident is asked to call the Cobb County police, 770-499-3987.