A 66-year-old man was bashed to death while watering his lawn in an argument over Sydney's water restrictions, police and media said Thursday.

A 36-year-old man, whose name has not been released, will appear in a Sydney court Thursday charged with murder following the fatal altercation Wednesday, a police statement said.

The alleged killer approached the older man, whose name has not been made public, as he watered his lawn in southern Sydney with a hose at 5:30 p.m. Wednesday and an argument ensued, police said.

Media reported the argument was over Sydney's water restrictions. The victim reportedly sprayed the younger man with the hose. Police said the younger man responded by punching and pushing the older man to the ground and kicking him.

An off-duty police officer intervened and arrested the younger man, the statement said. The older man was taken by ambulance to the hospital but died soon after, police said.

The victim was complying with Sydney's water restrictions when he was killed. Watering with hand-held hoses is allowed on Wednesdays and Sundays before 10 a.m. and after 4 p.m.