UPDATE: Motorcyclist identified in fatal collision on east side

TUCSON, Ariz. (KOLD News 13) - Tucson Police responded to a fatal crash at the intersection of Kolb Road and 19th street on Saturday night around 11:21 p.m. involving a motorcycle and a vehicle.

Upon arrival, Tucson Fire personnel were on scene rendering aid to a motorcyclist, 59-year-old Aaron Knosp. Unfortunately, he was determined dead at the scene. Officers say Knosp was not wearing a helmet at the time of this collision. Next of kin was notified.

Traffic Detectives were contacted and responded to continue the investigation.

According to witness interviews conducted by officers and detectives, Knosp was riding northbound on Kolb Road preparing to make a right turn onto 19th Street when he was struck from behind by a 2003 Acura TL. Witnesses said that the Acura was traveling at excessive speeds between 80 to 100 miles per hour. The collision spanned a distance of three blocks north from 19th Street.

Detectives interviewed one occupant of the Acura who remained at the scene, but are asking anyone with information about this collision to please call 88-CRIME. You can remain anonymous.

Interviews in conjunction with roadway evidence determined that excessive speed contributed to this collision.

The investigation is on-going and no charges or citations have been issued at this time.