A man has been charged with the murder of a 15-year-old boy whose body was found on the side of a road in Sydney’s south-west on Friday night.

Officers were called to Bushland off Wilton Park Road, Wilton, at around 7.25am on Saturday after the boy’s body was found by a passer-by.

Police say the teenager was a local from nearby Picton.

On Saturday afternoon, following a public appeal for information, a 32-year-old man walked into Narellan police station where he was arrested.

He has now been charged with murder.

The man was refused bail to appear in Parramatta Magistrates’ Court on Sunday.

Detectives will allege in court that the man stabbed the teenager during a physical altercation.

A crime scene was set up and the road was closed in both directions while police searched the local area, including service stations.

Earlier on Saturday, Acting NSW Police Superintendent Tim Calman said he was trying to establish the timeline of events.

“The information we have at this stage is that there may have been a group camping in that area and we believe that individuals associated with that camping event were involved,” Superintendent Calman said.

“We believe something happened on Friday night, but the exact time in relation to what actually happened is still under investigation.”