A 55-year-old man wanted by the Thornton Police Department on a warrant for the 2003 murder of a 29-year-old woman was taken into custody Monday morning by law enforcement in Iowa, Thornton police announced.

Robert McClain was arrested Monday by the Dubuque Police Department in connection with the 2003 murder of Rosa Arguello. McClain was charged with homicide. Arrangements are underway for McClain’s extradition to Colorado, police said.

Arguello’s body was found in a ditch in October 2003 with a dozen stab wounds.

Dubuque Police were informed that McClain may be involved in a Colorado homicide cold case and worked with the Thornton Police Department to investigate.

“We are grateful for our partners at Dubuque PD and will continue to work closely with the 17th Judicial District Attorne

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