In the continued efforts to find the person responsible, NSW Police have released a podcast episode about Braydon Worldon detailing new information about the case.

The young boy's body was discovered on the side of a road in Wantabadgery in December 2018 by a passing motorist.

The 15-year-old's death occurred a few hours after he had celebrated his birthday.

Police have revealed that they believe Braydon was hit by a heavy vehicle on River Road and that the driver knows what they have done.

In the podcast, Detective Senior Constable Stan Wall tells investigative journalist Adam Shand about how he was one of the first on the scene that "eerie night".

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"I was here the night it occurred," Detective Wall said.

"[The scene} was very quiet as you know it's a quiet, isolated piece of roadway. It was quite moonlit, there was no fog around or anything like that, and it was quite clear."

Detective Wall confirmed that Braydon's body was found in the middle of the road.

"We had a biomechanical engineer do an examination of the accident as well as an examination of the post-mortem results," he said.

"It's his opinion that due to the injuries Braydon suffered, he was hit by a heavier vehicle."

The road comes down through decline, a couple of curves and then, about 200 to 300 metres before the collision site, straightens up.

Detective Wall said there was no evidence that a vehicle had tried to stop.

"Accidents do occur, however, for how he was just left on the roadway is the big question," he said.

Braydon was last seen at his house at about 7.30pm. One theory is that he was on his way to see his grandmother, but that's a "fair walk" from where his body was found.

Detective Wall said it is a possibility they have already spoken to the person responsible.

To listen to the full episode, go to https://www.listnr.com/podcasts/nsw-police-state-crime-command-investigations.

Anyone with information about this incident is urged to contact Crime Stoppers or 1800 333 000 or at www.nsw.crimestoppers.com.au.

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