Officials say Raymundo Carranza had been an El Paso County Sheriff's deputy for 17 years. Carranza resigned Monday as he faces a charge of accident involving injury or death.
Carranza allegedly was driving his personal vehicle when 26-year-old Richard Lopez was struck and killed Saturday while changing a flat tire.
Investigators say toxicology results are pending for Carranza, who later returned to the scene of the accident and was arrested. He's free on $25,000 bond.
Information was not immediately available on an attorney for Carranza.