RED OAK, TEXAS (CBSDFW.COM) — A motorcyclist and a driver died Friday morning after they were hit by an 18-wheeler while in the middle of a highway in Red Oak, police say.

Around 4 a.m., authorities received multiple calls about a major accident involving a motorcycle and passenger vehicle in the southbound lanes of the 100 block of North IH-35E.

The Red Oak Police Department and Red Oak Fire Rescue were sent to the scene and started an investigation.

Based on their findings, officials said the motorcycle driver, 64-year-old William Moore, was ejected after an initial collision with the vehicle. The driver of the vehicle, 40-year-old Jerry Chapman, got out to check on the motorcyclist. As Chapman went into the lanes of traffic, an 18-wheeler then collided with him and Moore.

The driver of the 18-wheeler, whose identity has not been released, stopped on the side of the road.

Moore was pronounced dead at the scene and Chapman was transported to Medical City Hospital in Arlington where he later died from his injuries.

The crash remains under investigation.