On Jan. 6, Joshua Davis and his cousin were walking along Hall Boulevard -- a dark, wooded road leading from his mother's home to his father's home.
The cousin told investigators he went away for a few minutes and when he came back Joshua was on the ground.
"We have no clue what happened to our son," said Judy Creech, Joshua's mother.
For Creech and Dave Davis, the death of their son is devastating; not knowing why or how Joshua was killed is confusing and scary.
"It's all you're thinking about. You try to figure what scenario fits, which don't. You go to bed exhausted in your mind," Davis said.
"I think of every possible thing. Could have been an accident? maybe," Creech said. "I'm his mother. I just want my son back, but I know that's not going to happen."
Detectives said Josh suffered a blow to his head, but there is no evidence to explain what caused it. One theory is that a passing car with an object sticking out of it struck the teenager. Detectives point out how dark the location was at the time he was struck.
"If it was accidental, with a vehicle, a vehicle doesn't drive itself," Creech said.
Garner police say no matter what happened to Josh, someone is responsible for his death. They said the case is far from cold and said several people were interviewed this week.
"Somebody knows something about what happened whether they were a passerby in a vehicle or they were on foot. Somebody knows something and we encourage them to come forward," Blum said.
Douglas Perry, 18, contacted police, telling investigators he was there the night Josh was killed. Investigators later said Perry lied.
"It's a door being shut in our face every time," Creech said.
Still, Garner police said a large portion of crimes are solved through tips from callers. Anyone with information about the case is urged to call police at (919)772-8810 or the State Bureau of Investigation at (800) 334-3000.
A cash reward is being offered for information leading to an arrest.
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