A Williams man who is suspected of killing his girlfriend and her sister has been identified.

Gustavo Espino, 60, flagged down a Department of Public Safety trooper just before 9 p.m. Sunday in the Red Lake area, according to a Coconino County Sheriff's Office news release. He confessed to the trooper about killing his wife and her sister at their home, officials said.

Authorities found the bodies of 70-year-old Elaine Fann and her 65-year-old sister, Vivian Scheuerman, both of which are believed to have died from gunshot wounds, according to the release.

Autopsies will be performed by the Coconino County Medical Examiner's Office.

Espino is believed to be Fann's boyfriend and business partner or employee, according to the release. Although Espino confessed to killing his wife, officials haven't been able to verify that they were married.

Espino was booked into the Coconino County Detention Facility on suspicion of two counts of murder and is being held on a $2 million bond.

Reach the reporter at alexa.fuenmayor@arizonarepublic.com. Follow her on Twitter at @alexafuenmay.