The music and art festival attracts more than 70,000 people each year and will go on through Monday.
The death of a man at the Burning Man festival is being investigated as "suspicious", police say.
He was working at the event before being found unresponsive in his vehicle, in circumstances the police are investigating as "suspicious".
A man was found dead at Burning Man on Thursday, and was declared dead by event medical staff before county authorities arrived on the scene.
The cause of death hasn't been released, but Billingham had high levels of carbon monoxide in his blood "that would be poisonous to human life", officials said.
Nevada police are investigating Shane Billingham's death.
Preliminary toxicology showed the presence of controlled substances to be an exacerbating factor.
He was discovered by fellow festival-goers at his Beats Boutique camp at about 6:30pm, who immediately began CPR, however he was pronounced dead shortly after.
On Thursday, deputies responded to a report of a death and found a man who had already been moved to a medical tent at the festival.
Quantitative analysis of the toxicology will not be available for a few weeks, the sheriff's office said.
Friend Steve MacWithey told the Reno Post Gazette that Shane Billingham was "one of the best people I've ever known". He said friends who had stopped by to visit Billingham found him, the Reno Gazette reported.
It culminates with the symbolic ritual burning of a large wooden effigy, "The Man". that traditionally occurs on the Saturday evening of the event.