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, also faces charges of forging and possessing a government-issued document. He was being held without bail.

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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 strangled as she was dragged.

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

Court documents remained sealed in the case, and it was not clear what documents Rubi-Nava was accused of forging. District attorney's spokeswoman Kathleen Walsh declined comment.

Immigration officials have said they believe Rubi-Nava is an illegal immigrant.

A judge scheduled another hearing for Thursday to hear motions in the case.

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