The search warrants detail how law enforcement focused on Marilou Danley, the girlfriend of Mr. Paddock. She has not been charged with a crime and has spoken to investigators several times. Her lawyer has said she was not aware of Mr. Paddock’s deadly plans. The investigation is ongoing and these warrants only show the early stages of the investigation.

“She has been identified thus far as the most likely person who aided or abetted Stephen Paddock based on her informing law enforcement that her fingerprints would likely be found on the ammunition used during the attack,” according to court documents.

She told investigators she occasionally helped him load magazines. The F.B.I. said there was no evidence that she knew of his plans or had been deceptive. But the F.B.I. cautioned at the time that she was still the “subject of intensive review.”

Ms. Danley corroborated much of what had been previously pieced together by investigators but she was adamant that she had no…

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