Phoenix ? Two men who escaped from a private Arizona prison and a woman thought to have helped them have been linked to the investigation of a couple’s killing in New Mexico, authorities said Saturday.

New Mexico State Police spokesman Peter Olson said Tracy Province, John McCluskey and Casslyn Welch were linked through forensics but he declined to provide specifics.

He declined to say whether police believe the three were responsible for the killings, adding that “we don’t know how involved they are.”

Province, McCluskey and Daniel Renwick escaped from the medium-security Arizona State Prison near Kingman on July 30 after authorities say 44-year-old Casslyn Welch of Mesa threw wire cutters over the perimeter fence. Renwick was arrested in Colorado on Aug. 1.