Acting Superintendent Scott Bingham, the commander of the St George Local Area Command, said police were treating the young man's death as suspicious. Forensic police dust a phone box for fingerprints in Coleridge Street in Riverwood. Credit:Kate Geraghty He said the cause of the man's death was yet to be determined, but said he had not been shot or stabbed. The anonymous phone call to police was made at 12.50am from a public phone box on Coleridge Street, which intersects with Price Lane. That phone call could prove vital in determining how the man was injured, Acting Superintendent Bingham said.

"We would be calling at this stage for the person that made the phone call from the telephone box, if they could recontact police and assist us with our inquiries," he said. Police have taped off Price Lane in Riverwood, where a man was found critically injured. Credit:Kate Geraghty The circumstances leading up to the man's death are not known, and detectives are now trying to piece together his movements on the night of his death. One of the man's close family members is speaking to police about the man's plans for the night. Police said two people who were walking down Price Lane also came across the injured man, and made a separate triple zero call and provided first aid to the man. It was not known what time the second phone call was made. The anonymous call to triple zero was made from this public phone box in Riverwood. Credit:Kate Geraghty

Those two witnesses were speaking to police at the scene on Wednesday morning. "Those witnesses actually walked down the lane and came across the male as he was lying on the roadway," Acting Superintendent Bingham said. People who knew the dead man comfort each other near where his body was found. Credit:Kate Gergahty "We are aware that one of those witnesses actually assisted with first aid at the time, and the other one made a separate phone call to triple zero. "We'd be asking if there's anyone else that was down there, or anyone that used that phone box or saw anything in the area just before 1am this morning, if they could contact us here at St George or through Crime Stoppers."

Acting Superintendent Bingham said the dead man was not previously known to NSW Police. A group of distraught people, believed to be the man's friends, arrived at the lane early on Wednesday morning. They could be seen hugging each other and crying. Officers from the St George Local Area Command have set up a large crime scene in Riverwood, and have taped off the lane and the public phone box, which is outside a gym. Forensic police could be seen dusting the phone box on Coleridge Street for fingerprints. Detectives were also doorknocking homes and businesses in the area, searching for possible CCTV footage.

Acting Superintendent Bingham said police were still trying to contact the man's extended family. Those family members are believed to live in New Zealand. Anyone with information has been urged to call Crime Stoppers on 1800 333 000 or visit the Crime Stoppers online reporting page.