Teen shot dead in Sydney street

A 21-year-old man involved in a pub fight with a teenager who was shot dead in a western Sydney street has been charged with his murder.

Jed Coates (18) was fatally shot in the upper chest on Wednesday night, on his way home from watching the Blues win the State of Origin at the Colyton Hotel.

It's believed he had been celebrating his first Origin at the local pub as an 18-year-old.

Police and paramedics arrived at Nevada Avenue, Colyton, shortly before 11pm and gave the young man CPR before taking him to Westmead Hospital.

But he died a short time later.

Police confirmed on Thursday they had arrested a 21-year-old Colyton man at a house on the same street as the shooting just after 3am.

He was charged with murder and will appear at Mount Druitt Local Court on Thursday.

Detective Inspector Barry Vincent said Mr Coates was gunned down following an earlier incident at the Colyton Hotel involving both men and a number of other people.

"It'll be alleged that there has (then) been an altercation between the two persons here in the street," he told reporters.

"We believe an incident predicated what happened here in the street."

Det Insp Vincent would not confirm how many other people were there when Mr Coates was shot, but said police had received information from witnesses.

Neighbours reported hearing an argument in the street just before the incident.

Crystal Nikua, 32, said her daughter heard a loud noise outside but thought it was fireworks to celebrate NSW's Origin series win over Queensland.

"We didn't think anything of it and came outside and saw all the police cars," she told AAP.

"It wasn't until this morning that we found out it was a murder."

Mr Coates's family were told of his death overnight.

"Obviously it's a traumatic incident for the family," Det Insp Vincent said.

On Thursday morning, homicide detectives conducted extensive searches of a house on Nevada Avenue and a car outside.

There was no confirmation whether the gun had been found.

Dean White, a friend of Mr Coates, held back tears as he came to terms with the news.

"He was a good bloke, with a big heart," he told Macquarie Radio.

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