Oklahoma authorities investigating a mysterious death have come up with a rare theory. They are looking into whether or not a 65-year-old man died from spontaneously bursting into flames.

This is a case that I’ve never seen before,” said Sheriff Ron Lockhart.

Family members found 65-year-old Danny Vanzandt dead Monday inside his home on Bawkin Road outside Muldrow. “The body was burned and it was incinerated,” said Sheriff Lockhart.