A 45-year-old Tumbulgum woman is believed to have suffered a fatal heart attack minutes before Bluesfest headlining act John Fogerty took to the stage on Saturday night.
Paramedics performed CPR on the woman at the front of the Mojo stage for about 15 minutes before she was taken away on a stretcher.
The concert was delayed as a result for around 20 minutes. Police said there were no suspicious circumstances.
Meanwhile, police have praised crowd behaviour at the annual Bluesfest over the weekend despite issuing 150 infringement notices for drug offences.
Police drug-sniffer dogs were again on the beat at the festival and drivers were also randomly breathtested for alcohol and saliva-swabbed for illegal drugs on roads in and out of the site.
Police told media they searched 300 people and 20 vehicles for cannabis and amphetamines, but that overall crowd behaviour was positive.
