Man arrested for allegedly assaulting a police officer suddenly dies inside his cell

A man has died after he was arrested for allegedly assaulting a police officer in Northern New South Wales.

Richmond Police District officers were called to a showground on Summerland Way at Casino, following reports a man had been assaulted about 11am on Sunday.

Police will allege when they arrived at the showgrounds a 48-year-old man allegedly assaulted a police officer.

The man was arrested and taken to Casino Police Station.

 A critical incident team from the State Crime Command’s Homicide Squad will now investigate all circumstances surrounding the man’s death (stock image pictured)

While in custody, the man became unconscious.

Police and NSW Ambulance paramedics tried to revive the man however he died in custody.

A critical incident team from the State Crime Command’s Homicide Squad will now investigate all circumstances surrounding the man’s death.

The investigation will be subject to an independent review and a report will be prepared for the Coroner.