An 18-year-old man has died after tripping and falling at the Knockout Circuz music festival in Sydney over the weekend.
According to NSW Police, he fell over the feet of several people sitting near the entrance of a hall at Homebush.
He is understood to have hit his head in the fall.
The police were involved after the man became irritated, drifting in and out of consciousness and becoming physically violent.
He was restrained taken to Westmead hospital and later died.
Police have urged any witnesses to come forward as the critical investigation team investigates.