The FBI has a startling new development in the investigation the deadliest mass shooting in modern U.S. history, after revealing search warrants on the shooter and his significant other.

The girlfriend the gunman behind the Las Vegas shooting told authorities that her fingerprints might be found on some his bullets because she would help the killer load magazines at times. Potentially, some the same bullets that took the lives 58 people and aided in Steve Paddock’s own suicide.

were made public on Friday, in which Marilou Danley cooperated with investigators, returned to the U.S. from the Philippines pending the investigation, and it was determined there was no known “criminal involvement” any kind by the girlfriend.

Still, investigators never ruled out the possibility her connection to Paddock’s violent plan.

The newly released documents also revealed Paddock had a number email exchanges pursuing funs and accessories, well before he carried out his deadly crime.

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