Ivan Miller was arrested in Colorado and faces three counts of aggravated murder after a multi-state manhunt following killings in rural Utah.The suspect allegedly killed Margaret Oldroyd, Linda Dewey, and Natalie Graves to steal their Buick and Subaru vehicles to return to Iowa.Local authorities and the FBI tracked the 22-year-old across four states using vehicle key-fob data and credit card transactions.Miller was eventually apprehended in Pagosa Springs while in possession of a handgun and a large knife used during the crimes.