An Arizona man who sold ammunition to the gunman in the deadliest mass shooting in modern U.S. history says there was no way he could see into the man's mind.

Douglas Haig said at a news conference Friday that he met Stephen Paddock at a Phoenix gun show in the weeks before the Oct. 1 shooting in Las Vegas that killed 58 people.

The sale was later completed at Haig's home in the Phoenix suburb of Mesa. Haig said there was no way he could see into Paddock's mine before that sale.

"I've had people pounding on my door, death threats," he said. "One woman screaming through my door that I should be killed and I should die."

Haig was named as a "person of interest" in the investigation in court documents released last month.

"It's been not a lot of fun, quite frankly," Haig said.

Investigators say Paddock was the lone shooter and had no accomplices, but Haig was considered a person of interest because he sold tracer ammunition to the shooter.

"Revulsion, sickness, horrified that this man would do something like that," Haig said. "Probably one of the most horrible things I've ever been told or heard of."

Haig said he sold 720 rounds of ammunition to Paddock, but none of it was used in the shooting.

He also said that Paddock didn't seem suspicious when they met in person -- and the transaction was completely legal.

"He said that he was going to go out to the desert and put a light show either with or for his friends," said Haig. "I can't remember whether he used the word with or for, but he said that he was going to go out and shoot at night with friends."

A law enforcement official has since told The Associated Press that Haig isn't believed to have committed a federal crime or to have had any knowledge of the attack.

The official wasn't authorized to discuss the investigation and spoke on condition of anonymity.

Haig's lawyer said his client has been nothing but cooperative with federal authorities and has spent hours answering questions. Now, the lawyer said, his client wants his reputation cleared with the public, too, so the threats stop.