Dallas firefighter William Tanksley 41, killed after falling, or possibly being struck by a vehicle, from I-20 overpass onto pavement below.

A firefighter was fatally injured Monday night after either falling or being being knocked from an icy overpass by a vehicle in Southwest Dallas.

Dallas Fire-Rescue confirmed firefighter William Tanksley, a 14-year veteran of the department, died of his injuries. He leaves behind a wife and three children.

According to initial information, Tanksley was working at the scene of an accident at the intersection of Interstate 20 and Spur 408 when he tumbled to the pavement below. There were reports the firefighter may have been hit by a vehicle.

Emergency vehicles had a difficult time reaching the scene because icy conditions were slowing traffic, and a helicopter ambulance was not an option due to the unfavorable weather.

Dallas Fire-Rescue Chief Louie Bright said Tanksley was doing his job as they do every day.

"As always, the department is going to wrap our arms around his family, and our own fire department family," Chief Bright said.

Tanksley was taken by ground ambulance to Dallas Methodist Medical Center for treatment, but was pronounced dead upon arrival.

"We have a resilient group of men and women that work for us, and we are going to pull together, and get through this incident, and keep moving forward," Chief Bright said.