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GREELEY, Colo. — The driver who died after a crash in Weld County on Tuesday morning had been shot before the accident, the Weld County Coroner’s Office said Thursday.

Investigators said it might be a case of road rage.

The coroner performed an autopsy but has not issued an official determination on the cause of death of 33-year-old Alberto Ruiz Jr. of Greeley.

Witnesses said a driver forced Ruiz to crash his pickup into a concrete wall in the 3000 block of West 29th Street about 11 a.m. Tuesday.

“The information we have is this was possibly a traffic altercation,” Lt. Adam Turk with the Greeley Police Department said. “We have witnesses that have reported some type of road rage incident between another vehicle.”

Witnesses said another pickup truck sped away after the collision. Officers started searching for the driver but have not arrested a suspect.

Police have released a picture of what they said is the suspect’s truck — described as a tan or gold Chevrolet.

Detectives are still interviewing witnesses and reviewing video surveillance.

If anyone has information on the case, they are asked to call police at 970-350-9603, 970-350-9605 or 970-350-9670.