Emergency services were called to a property on Bingleburra Road, Bingleburra, at about midday on Sunday, May 12, following reports two men had been shot.

It is understood the family was celebrating Mother's Day when a dispute broke out between the stepbrothers.

Police said two men - aged 35 and 28 - were involved in an altercation, where the older man sustained a gunshot wound to the chest.

They said the younger man fled the property but was found nearby, suffering a gunshot wound to the head that was believed to be self-inflicted.

Both men were treated at the scene by NSW Ambulance paramedics before they were airlifted to John Hunter Hospital.

The younger man was in a critical condition in intensive care, and the older man was in a serious but stable condition.

On Tuesday, May 14, the younger man died, NSW Police Media said.

The older man remains at John Hunter Hospital in a serious but stable condition.

Officers from Port Stephens-Hunter Police District would continue to investigate the incident and a report would be prepared for the Coroner.

Anyone with information about this incident is urged to contact Crime Stoppers: 1800 333 000. Information is treated in strict confidence. The public is reminded not to report crime via NSW Police social media pages.

Lifeline: 13 11 14.

Related: Shooting at Bingleburra near Dungog

This story originally appeared on The Newcastle Herald