Court told fatal Sydney fight was arranged on Facebook

A teenager's mother and brother desperately tried to stop him going to a pre-arranged fist fight where he was shot dead, a Sydney court has been told.

Jed Coates, 18, took along a shovel to the "one on one" fight arranged on Facebook after he exchanged abusive messages with Matthew James Perry.

The pair, who had gone to the same school, had earlier thrown punches at each other leading to their being ejected from a pub where they had watched a State of Origin match.

Perry, 23, has pleaded guilty in the NSW Supreme Court to murdering Mr Coates late on June 18, 2014, in a street at Colyton, in western Sydney.

According to a statement of agreed facts tendered to the judge today, a security guard described Mr Coates and a friend as being drunk and yelling out to Perry in the car park after they were thrown out of the pub.

"We are going to get you," said Mr Coates, while his friend yelled: "We know where you live. I will get a knife and stab you and your family".

Both Mr Coates and Perry went to their nearby homes, but after the Facebook abuse and fight arrangement the teenager's mother tried to talk him out of going to the meeting.

She also contacted his brother to get him to persuade him not to meet Perry, but he too was unsuccessful.

Meanwhile, Perry's mother stopped her son from taking a knife with knuckledusters to the meeting, unaware he had taken a gun instead.

At about 11pm, nearby residents heard shouting including words to the effect of "just shoot me, just shoot me" and "just shoot him, just shoot him".

They also heard: "just walk away Jed, just walk away" and "I'll f------ shoot you".

Perry was armed with a .22 calibre firearm, about 35-40cm long, which he pointed at Mr Coates and his friend, moving it backwards and forwards.

After the pair stepped backwards, Perry fired the gun fatally wounding Mr Coates.

"It is agreed that the offender acted with reckless indifference to human life and that the shooting was not pre-meditated, but was a spontaneous act at the scene," the facts said.

The matter was adjourned to July 28.