A 15-year-old boy was fishing Saturday afternoon near the Monterey Dam when police say he saw pants and shoes in the river and possibly a body. He reported the incident at a nearby business.
Officers checked the area and located a body approximately 15 to 20 feet from shore, according to a news release.
Janesville Fire Department was requested to assist with recovering the body, which then was transported to Madison for identification.
Police first were called about Coulthard's disappearance the morning of May 3, 2014.
Officers soon discovered a water bottle they believe was used by Coulthard on the Milwaukee Street Bridge, as well as other personal items south of the bridge on the shore.
Authorities began a ground and water search in the Janesville area and the aerial search along the river to the Illinois state line, according to a police news release.
That mystery deepened quickly two days later when police discovered the body of Britney Cross, a 21-year-old Edgerton woman, near the Rock River just south of the Memorial Street Bridge. She died from blunt trauma to the head, and police are investigating her death as a homicide.
Clayton J. Courtney, 28, described as Cross's boyfriend, is the lone suspect in her death, police said during a Tuesday news conference.
Coulthard's brother said Monday that detectives told him they did't believe the stabbing and homicide cases are related to his sister. Jerry Quincy, who said he talked to his sister a week earlier, spent Monday evening down by the Rock River where earlier that day a body had been discovered.
Coulthard was the kind of person who liked to help people, Quincy said, although he said he wasn't quite sure if that was a smart thing to do, I light of the recent developments.
"She was a very kind person," Quincy said. "If you didn't have something, she would get it for you. That's the kind of person she was."