A New Zealand man attending Burning Man was found dead at the Nevada festival under suspicious circumstances, authorities said.

Shane Billingham, 33, was found unresponsive in his vehicle around 6:30 p.m. Thursday at his campsite in the Black Rock Desert, the Reno Gazette-Journal reported.

He was brought to the festival’s emergency care center, where he was pronounced dead by an on-duty physician, according to the Perishing County Sheriff’s Office.

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.

Deputies secured the scene where Billingham was found for further investigation.

Billingham’s friends who attended the festival alongside him remembered the partygoer as loving and happy.

“He was one of the best people I’ve ever known,” Steve MacWithey told the Gazette-Journal.

The camp where Billingham was staying — Beats Beautique — held a memorial Thursday evening to honor the festival attendee.

“I miss him. I’m never going to let him be forgotten,” MacWithey said.

The music and art festival attracts more than 70,000 people each year and will go on through Monday.