Douglas Haig told The Associated Press yesterday that he had been contacted earlier by investigators in the case.
Speaking at his suburban home in Mesa, Haig said he planned to hold a news conference later this week to answer questions about his name surfacing in the investigation.
"I am the guy who sold ammunition to Stephen Paddock," Haig said without disclosing any details. Police say Paddock was the gunman and killed himself as officers converged on him.
The official spoke anonymously because they weren't authorised to disclose case information. It was not immediately clear if that person was Haig.
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Records show Haig owns Specialised Military Ammunition LLC. The company's website says it sold tracer and incendiary ammunition but is now "closed indefinitely."
Haig's name emerged by mistake yesterday when court documents were released nearly four months after the shooting.
The documents did not disclose why authorities considered Haig a person of interest.
The documents show that early in the investigation, police believed Paddock must have had help.
"Given the magnitude of the incident, it is reasonable to believe multiple suspects and months of planning were involved in this premeditated massacre," said one search warrant request submitted to a judge nine days after the shooting stopped.
However, Clark County Sheriff Joe Lombardo released a preliminary report on Jan. 19 saying police and the FBI believe Paddock acted alone before he killed himself as police closed in.
Haig's name was blacked out in the more than 270 pages of search warrant records released by a Nevada judge to The Associated Press, but remained on one page of documents provided to the Las Vegas Review-Journal.
The newspaper published the name online. Clark County District Court Judge Elissa Cadish later ordered the full document not be published without redactions, but she acknowledged she couldn't order the newspaper to retract the name.
The warrants show that investigators found 23 rifles and a handgun in Paddock's 32nd-floor hotel suite and an adjoining room. Police also found five suitcases, five rifle cases, binoculars, a spotter scope, portable solar generator and 1,050 empty bullet casings.
Police reported finding just USD 273 in cash in the room of the 64-year-old retired accountant who amassed a millionaire's fortune, owned homes in Reno and Mesquite, Nevada, and earned casino perks wagering thousands of dollars on high-stakes video poker.