An Arizona man who sold ammunition to the gunman responsible for the 2017 mass shooting in Las Vegas, Nevada, has plead guilty to federal charges. The man, Douglas Haig, admitted to manufacturing ammunition without a license at a workshop inside his Mesa, Arizona home, according to the US Attorney’s Office in Nevada.

On October 1st 2017, a gunman on the 32nd floor of the MGM-owned Mandalay Bay Hotel shot down thousands of rounds of ammunition on a crowd of festival goers attending the Route 91 Harvest Festival.

Haig, who works as an aerospace engineer in addition to his work as an ammunition reseller, has previously stated that he sold the gunman tracer ammunition at his home in September 2017 after they met at a gun show. This ammunition has a pyrotechnic charge that leaves an illuminated trace when fired, improving the shooter’s precision.

Investigators state that Haig operated an illegal ammunition business called Specialized Military Ammunition from his home between July 2016 to about October 19, 2017. The ammunition he manufactured were sold at various gun shows across several states including Arizona and Nevada.

The Federal Bureau of Investigation (FBI) closed its investigation into the shooting earlier this year, although a motive for the shooting has never been revealed. Despite the lack of a motive, investigators have agreed that the gunman meticulously planned this attack to cause as many casualties as possible.

MGM Resorts agreed to pay out up to $800 million in liability claims, stemming from this mass shooting earlier this year.

“While nothing will be able to bring back the lives lost or undo the horrors so many suffered on that day, this settlement will provide fair compensation for thousands of victims and their families,” Robert Eglet, a lawyer who has been leading talks on behalf of shooting victims said, adding, “We believe that the terms of this settlement represent the best outcome for our clients and will provide the greatest good for those impacted by these events.”