Police were called to the home in Wuruma Place, Warriewood, after reports of yelling. When they arrived, they found three men fighting by the side of the house.

One man, 45, was unresponsive. He was taken to Mona Vale hospital in a critical condition but died on arrival.

The two other men, aged 40 and 43 were arrested and taken to Manly Police station. The younger man was later taken to Manly Hospital for treatment for minor injuries, but returned to the station afterwards to assist police with their investigation.

Both men have been released.

Specialist forensic officers will examine the crime scene, according to police.

"It was a family member's house. The three brothers were having a bit of a scuffle," a NSW police media spokeswoman said.

Police are investigating whether the man may have been affected by drugs or suffered a medical episode during the altercation, she said.

Witnesses who have not yet spoken to police are asked to contact Dee Why Police Station on 02 9971 3399 or Crime Stoppers on 1800 333 000.

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