The girlfriend of the gunman behind the deadliest mass shooting in modern U.S. history told authorities they would probably find her fingerprints on bullets because she sometimes helped him load ammunition magazines.

An FBI agent tells a judge in warrant documents made public Friday that Marilou Danley wasn't arrested when she returned to the U.S. from the Philippines days after the Oct. 1 shooting, and that she was cooperating with investigators.

Her boyfriend, Stephen Paddock, shot himself dead after firing from a Las Vegas Strip casino into a concert crowd, killing 58 people and injuring hundreds.

The agent says in the Oct. 3 document that there was no evidence at that time of "criminal involvement" by Danley, but that investigators had not ruled out the possibility.

The document says Danley also provided a DNA sample to authorities.


Paddock exchanged emails about buying rifles and bump stocks months before he carried out the deadliest mass shooting in modern U.S. history using guns equipped with the device that allows semi-automatic weapons to fire nearly as fast as automatic ones.

His emails were disclosed in affidavits unsealed Friday after several media organizations, including The Associated Press, fought for their release.

The documents said Paddock had received an email from a Gmail account in July encouraging him to try an AR-style rifle before buying one. It said, "we have huge selection" in the Las Vegas area.


Paddock's email address and the Gmail address had similar names. Investigators say they suspect he may have been emailing himself, but couldn't figure out why.