UPDATE: One of the three men injured in a wild brawl at Murwillumbah's Knox Park has lost his fight for life.
The 46-year-old was taken to Tweed Hospital where he died on Tuesday afternoon.
An 18-year-old man was taken to Gold Coast University Hospital in a critical condition, while a 29-year-old man has now been released from Murwillumbah Hospital.
His injuries were only minor.
A 32-year-old man was in custody but was yet to be charged.
EARLIER: NSW police have declared several crime scenes in Murwillumbah after three people were wounded when violence broke out in Knox Park on Tuesday afternoon.
Police were called to Brisbane Street about 12.30pm after reports of a number of people fighting.
Three men were taken to hospital with stab wounds, one of those is in a serious condition.
A man is in custody and was being questioned by police.