An Arizona man has been arrested for manufacturing illegal ammunition that was found in the hotel room of Las Vegas shooter Stephen Paddock, CNN reports.

Douglas Haig, who previously admitted to selling tracer rounds to the shooter, was arrested Friday after it was revealed that his fingerprints were on two unfired and illegally made armor-piercing bullets found in the shooter's hotel room.

An FBI sweep of Haig's house in October after the deadly shooting found more of the ammunition, which Haig did not have a license to produce.

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Haig maintained that he had made "no contribution" to the killings since investigators found tracer rounds were not used in the attack. His attorney said the ammunition had not been altered at all.

Haig was released after a court appearance on Friday. He could face a maximum $250,000 fine for the federal ammunition manufacturing charge and up to five years in prison. The court has set Feb. 15 for a preliminary hearing.

Paddock fired thousands of rounds from a hotel window at a country music concert on the Las Vegas strip on Oct. 1, killing 58 and wounding 422 others in the deadliest mass shooting in modern U.S. history. Paddock's motivation for the killing remains unknown.