MARSHALL — A preliminary autopsy in the officer-involved shooting death of Demetrius Williams shows he died of a single gunshot wound, refuting what witnesses told the man’s family.

“We know that there was one wound and we know that there was only one wound,” said Lt. Jay Webb of the Harrison County Sheriff’s Office. “There’s not 17 (wounds), there’s not 34.”

According to the sheriff’s office, a SWAT team went to Williams’ home on South Allen Street in Marshall about 11 a.m. Thursday to execute a narcotics search warrant.

Webb said Williams, 31, was the subject of the investigation.

The Texas Municipal Police Association said in a statement Saturday that officers were attempting to bring Williams into custody when he attempted to flee in his vehicle at a high rate of speed.

“While driving in reverse, Williams struck another vehicle, and then began driving forward towards several deputies,” said Kevin Lawrence, executive director of the association. “One deputy was struck by Williams’ vehicle.”

He said that under state law, a vehicle driven in this manner may constitute a “deadly weapon” if its use or intended use is capable of causing death or serious bodily injury.

Williams’ family members said they believe he was shot unlawfully and are pursuing litigation. They have retained civil rights attorney Lee Merritt to represent them. Merritt announced the hiring Monday on Twitter.

Merritt represented the family of Botham Jean, who was killed by former Dallas police officer Amber Guyger, who was sentenced to 10 years in prison in October for fatally shooting her unarmed neighbor in his apartment.

The Texas Rangers are investigating the shooting.