It was this release that sparked the new interest in finding more bodies on the ranch. Two decades ago, prosecutors "didn't feel the need to spend the money to try [McCormick] again if he was already put away for life," Holloway explained. "Since there's no statute of limitations on homicide, we thought maybe the case could be rejuvenated and charges could be used against the responsible parties."
Complicating the case has been the absence of anyone coming forward to notify police that their loved ones may be missing. The three bodies recovered in 1986 were of James Plance, Robert Sowarch and James Sinclair. Not one of the men, who were transients, had been reported missing.
The family of Plance was notified of his death last year only after DNA confirmed his identity. Two of the victims had been shot and another had been beaten to death, Holloway said. Two weapons were used in at least one of the murders, indicating two killers may have been involved.
Although no one is certain how many had been killed on the ranch, Holloway said, "some other names came up in the investigation of people that worked out there on the ranch where nobody knew what happened to them."
She has focused efforts on gathering teams to return to the ranch to recover more bodies. She has enlisted the help of NecroSearch, a private Denver-based nonprofit organization that aids in the recovery of hidden bodies. Using aerial photography it has been able to compare pictures of the ranch from then and now to narrow down areas where potential graves may be located on the massive estate, Holloway explained.
Leslie Clapper, who now owns the McCormick property with her husband, Charles, believes more bodies may be hidden there.
"Every once in awhile the plow will dig up something like a shoe or a piece of clothing," she told ABC News. But apart from the occasional feeling of fright she gets when walking through the building in which Thomas and Michael used to live, she said if there are more bodies her family "would just like them to be found and returned to their families."
Robert Watson of the 13th Judicial District Attorney's Office agrees. "I'm doing it because it's the right thing to do. If there are victims out there we need to recover them and return the bodies to their families."