At least 77 people have been killed and 151,000 acres burned so far in California's deadliest-ever fire.
A witness said a man shot a woman he had been speaking to and then began shooting others, NBC station WMAQ reported.
“The evidence was absolutely mind-blowing to me," said the lead researcher.
Former Cuyahoga County Judge Lance Mason was charged Monday with felonious assault in the crash but he has not been charged in his former wife's death.
The 18-year-old called the talk a joke, but authorities found more than 1,600 rounds of ammunition, as well as weapons, in the home of his host family.