The man who sold ammunition to the Las Vegas gunman responsible for the largest mass shooting in the history of the United States was indicted by a grand jury on one count of engaging in the business of manufacturing ammunition without a license.

Authorities say that 51-year-old Douglas Haig ran an online business where he sold "high-explosive armor-piercing incendiary ammunition, armor-piercing incendiary ammunition, and armor-piercing ammunition." They linked Haig to the Las Vegas shooter after they found a box of bullets which had a shipping label with his name and address on it. They also found his fingerprints on some of the unfired bullets.

Haig admitted to investigators that he sold 40 rounds to the gunman at a Las Vegas gun show in August 2017, and then another 720 rounds of "tracer" ammunition a few weeks later at his home in Mesa, Arizona.

Haig explained that along with selling new rounds of ammunition he also reloads ammunition, but claimed that he does not sell the reloaded bullets to customers. He told officials that none of the bullets used in the Las Vegas massacre would have tool marks consistent with the machine he uses to reload bullets, but police said they found the tool marks on at least two unfired bullets in the room where the shooter opened fire.

Haig was forced to close his ammunition business after it was revealed he supplied the shooter with bullets. During a press conference in February, he said that he started receiving death threats after his involvement was made public by investigators.

"I've had people pounding at my door, death threats. One woman screaming through my door that I should be killed and I should die. It's been not a lot of fun, quite frankly. It makes me feel horrible. People need to do their research, and think rather than react viscerally."

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