The shooting further shocked the world when investigators failed to find any sort of motive, even though there was evidence proving that Paddock had planned the shooting for months.
Speaking from his home in Mesa, Arizona, Haig said: "I am the guy who sold ammunition to Stephen Paddock". He declined to provide additional details, saying he will answer questions at a news conference Friday with his attorney. Haig told Paddock to give him a call. Las Vegas police officials told CNN the department can not comment on Haig or any names, and referred CNN to federal authorities.
Separately, Clark County District Court Judge Timothy Williams ruled Tuesday that the coroner in Las Vegas should release autopsy records of Paddock and the people killed by gunfire, with victims' names blacked out.
The other person of interest was Marilou Danley, Paddock's girlfriend.
The LVMPD released a preliminary investigative report on the Las Vegas mass shooting on January 20.
The Associated Press and the Las Vegas Review-Journal have requested the autopsy records for both Stephen Paddock and all 58 victims of the 1 October shooting.
The man, Douglas Haig, works as an engineer in Arizona and runs the Specialized Military Ammunition company while also working for Honeywell Aerospace, according to The New York Times. "They were following up on a lead, and obviously it went nowhere", he told Newsweek. Haig once had his own side business selling ammunition and sold ammo to Paddock not knowing weeks later Paddock would open fire on a concert from the Mandalay Bay Hotel. The company's website says it sold tracer and incendiary ammunition but is now "closed indefinitely".
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Correction: This story has been revised to give the correct first name of Douglas Haig, identified as a person of interest in the case.
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Almost 300 pages of search warrant records were unsealed Tuesday by a judge, and one document publicly identified an additional person sought by police for questioning, reported the Las Vegas Review Journal.
But the judge allowed a small portion of those records to be redacted because "there is an ongoing investigation regarding charges against another individual, arising out of information obtained in connection with the ... shooting, but not directly related to the shooting".
Authorities have said an unnamed person could face unspecified charges in the October 1 shooting that killed 58 people and injured more than 800 others on the Las Vegas Strip. He reportedly said he could not comment on a federal case.
Paddock's shooting left 58 dead and more than 500 wounded after he rained hundreds of rounds down on a Las Vegas music festival from his suite in the Mandalay Bay hotel. The coroner has already said that all 58 died of gunshot wounds.
The court documents showed that early in the investigation, police believed Paddock may have had help.