SALEM, Ore. — The discovery of a black Labrador named Lucy led to the unraveling of a criminal case Monday against an Oregon man who had begun serving a 50-year prison sentence.

Joshua Horner, a plumber from the central Oregon town of Redmond, was convicted on April 12, 2017, of sexual abuse of a minor.

In the trial, the complainant testified Horner had threatened to shoot her animals if she went to the police about the alleged molestation, and said she saw him shoot her dog and kill it to make his point.

Six months after a jury convicted Horner in a verdict that was not unanimous, he asked the Oregon Innocence Project for help. The group took up his case.

When the group raised concerns in April about the case with Deschutes County District Attorney John Hummel, he agreed to work with them.

Horner had insisted he never shot the dog. Finding the dog would show the complainant had lied under oath. But if it was alive, where was it?

An Oregon Innocence Project volunteer and an official from Hummel’s office searched for it. The black Lab had reportedly been given away. The investigators were sniffing on the trail, but they had trouble tracking down the purported dog’s owner.

“They made a couple trips around Deschutes County; he was not there,” said Steve Wax, legal director of the Oregon Innocence Project. “We heard he was in Seattle. Then we learned he had a place on the Oregon Coast.”

It was there, in the town of Gearhart northwest of Portland, that the pair finally found Lucy after her owners agreed to rendezvous at a golf course.

“She was drinking a bowl of water and sitting in shade underneath a porch. We played with her. Petted her. It was wonderful,” said Lisa Christon, the Oregon Innocence Project volunteer.

Lucy was identified by an undisputed chain of custody and her looks.

“She’s a very distinctive-looking black Lab; not purebred. She’s got this adorable shaped head and really long ears,” Christon said.

That key evidence showed the complainant had not been truthful when testifying, the district attorney said.

“Lucy the dog was not shot. Lucy the dog is alive and well,” Hummel’s office said in a statement.

Hummel told the court Monday he’s not certain that Horner did not sexually abuse the complainant, but that he’s now not convinced he did. The Associated Press is not naming her because it typically does not identify alleged victims of sexual abuse.