Follow CBSDFW.COM: Facebook | Twitter

ROCKWALL (CBSDFW.COM) – According to Rockwall police, a suspect vehicle has been revealed during the investigation of a fatal motorcycle crash that occurred Thursday afternoon on westbound I-30.

READ MORE: AMC Theatres To Offer Open Caption Showtimes In More Than 100 U.S. Markets

According to reports, the motorcyclist, 73-year-old Douglas Lewis, struck a mattress, which caused him to leave the roadway and hit a light pole.

He was transported to the hospital where he died from his injuries.

According to witnesses, the mattress came out of the bed of a red Ford F-150 that was traveling in the same direction as the motorcyclist.

READ MORE: Republicans In Texas Advance New Congressional Map That Would Tighten Their Slipping Grip

Witnesses also observed two females adjusting what remained of their load in the bed of the truck in the right shoulder of the road near the Horizon Road overpass.

Rockwall police are requesting the public’s assistance in identifying the occupants of the suspect vehicle.

Anyone with information reading this incident should contact the Rockwall Police Department’s Traffic Division at 972.772.6703. Those who wish to remain anonymous should contact the Rockwall County Crime Stoppers Tip hotline at 972.771.8477.

MORE NEWS: 'My Nerves Are Still Rattled': Passenger Aboard Amtrak Train Talks Crash

(©2016 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)