Routt National Forest, where a hunter found a human skeleton in September 2007. (Courtesy of Rob McLeod)

Bushwhacking through a dense section of Routt National Forest in the shadow of Little Haystack Mountain, a hunter finds a human skeleton.

“If I hadn’t been at that exact spot at that time of the morning with the sun glinting off the skull, I would not have seen it,” said the hunter, a Brighton resident who asked that his name not be used. “Something happened. Somebody wanted me to find it.”

With snow in the forecast, the hunter ties a rope to a tree to mark his find, packs the skull carefully in his backpack, and continues his trek.

He calls 911 the next day, and the Jackson County coroner takes possession of the remains, thought to belong to a young woman.

The Sheriff’s Office writes up a full report, and the Colorado Bureau of Investigation is notified, but news of the find doesn’t reach the FBI for six months.

The receipt, found in a box of Kimball's belongings. (Courtesy of Lafayette police)

Nagged by a $17.95 grocery store receipt found in Scott Kimball’s possessions, FBI Special Agent Jonathan Grusing decides to take a closer look around Walden, Colo.

The receipt — dated Aug. 24, 2003, one day after the disappearance of Kaysi McLeod. — came from the North Park Supers store in the tiny northern Colorado mountain town.

Scott Kimball, who said he was alone in the mountains the day Kaysi disappeared, had later told Grusing that she might have overdosed on drugs somewhere on national forest land.

Grusing calls the Routt National Forest district office in Walden to ask for a map of the area, and a receptionist tells him it costs $8.

In no mood to fill out an expense sheet, Grusing asks to talk to someone higher up the chain of command.

He tells supervisor Sue Yeager he’s with the FBI and is searching for human remains. She says she’ll get some maps out right away.

Then, almost as an afterthought, she tells him to talk to the coroner. A skull, likely belonging to a young female, had been discovered by a hunter six months earlier in a remote area southwest of town.

“When she told me that, I pretty much knew it was Kaysi,” Grusing recalls.

An initial DNA analysis 2 1/2 weeks later will point to the same conclusion.

Lafayette police detective Gary Thatcher, left, and FBI Special Agent Jonathan Grusing, near the site where a hunter discovered Kaysi McLeod's body. (Courtesy of Rob McLeod)

A final DNA analysis at the FBI’s lab in Quantico, Va., identifies the remains found in Routt National Forest the previous fall as those of Kaysi McLeod.

Investigators, along with Kaysi’s family, will return to the site looking for evidence, but nothing is uncovered.