A Pueblo man was arrested last week after police allege he shot and killed his girlfriend's mother , according to a Pueblo Police Department arrest affidavit.

Alehandro Chacon, 20, was charged with first-degree murder in connection with the death of 47-year-old Andrea Martinez. He was arrested on Sept. 3 with the assistance of the U.S. Marshals' Colorado Violent Offender Task Force.

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