Colorado ? Prosecutors filed murder and kidnapping charges Monday against a man accused in the gruesome dragging death of his 49-year-old girlfriend.

Jose Luis Rubi-Nava, 36, faces charges of first-degree murder after deliberation and second-degree kidnapping. He also faces charges of forging and possessing a government-issued document. He was being held without bail and has not yet entered a plea.

The battered and disfigured body of Luz Marie Franco Fierros was found Sept. 18 in a normally quiet subdivision about 20 miles south of Denver.

Investigators say Franco Fierros had been dragged behind a vehicle for more than a mile, leaving a bloody trail. Preliminary autopsy results said she suffered fatal head injuries and was strangled as she was dragged.

She was identified by matching her fingerprints to Mexican voter registration records.

Rubi-Nava could face the death penalty or life in prison if convicted of the murder count, and between one and eight years on each of the lesser charges. Prosecutors have not said what kind of sentence they would seek.