Pioche was picking something up in the road at 5:15 p.m. when Joe Gallegos, 43, allegedly ran her over with a Ford Explorer and killed her, police said.
Witnesses told police Pioche was thrown into the air and then run over.
Several people told police the woman was dragged more than 30 feet before the vehicle stopped, according to court documents.
Pioche lived off of South Wagner Avenue, a few blocks from where she was killed, Farmington police Lt. Taft Tracy said.
Gallegos, a contract driver for The Daily Times, fled to a nearby mobile home that was parked behind Fast Freddie's Auto, immediately after the accident, police said.
He was arrested by police on suspicion of DWI, Tracy said. He allegedly failed a field sobriety test and appeared to be under the influence of narcotics, police said.
Police obtained a search warrant for the mobile home Wednesday night and found 15.5 grams of heroin and 13.5 grams of cocaine, Tracy said.
Gallegos was booked into San Juan County Adult Detention Center early Thursday morning. He has been charged with homicide by vehicle, leaving the scene of an accident, tampering with evidence, possession of heroin and cocaine with intent to distribute and aggravated DWI.
Gallegos appeared before Farmington Magistrate Judge Stanley King on Thursday morning.
King said he considered Gallegos a flight risk and a danger to the community and set bail at $500,000 cash.
Pioche was the second traffic fatality Farmington police have responded to this year.
Andrew Pope, 18, was killed Aug. 2 when he turned his car onto Piñon Hills Boulevard from Butler Avenue and was struck by a truck.