Man admits murder after Origin at pub

A man has pleaded guilty to the shooting murder of a teenager after a fight in a Sydney pub where they had watched a State of Origin game two years ago.

Matthew James Perry, 23, entered his plea in the NSW Supreme Court on Wednesday, just before his trial was due to start.

Jed Coates, 18, was gunned down in a street near his home at Colyton, in western Sydney, late on June 18, 2014, after the pair were thrown out of the pub for fighting.

He suffered a single gunshot wound to his upper body. He was treated at the scene by paramedics before being taken to hospital where he died.

Acting Justice Jane Mathews adjourned the case to Friday for preliminary evidence on sentencing.

Mr Coates' distraught mother and other family members declined to comment as they left the court complex.