The girlfriend of Las Vegas shooter Stephen Paddock has been put on a government watch list that will notify federal investigators any time she boards a plane or tries to leave the country.

Marilou Danley, 62, was initially called a person of interest by investigators, but officials say they now don't believe she has anything to do with the Mandalay Bay shooting - the deadliest in U.S. history.

Nevertheless, they're going to be keeping an eye on her.

Marilou Danley, left and right, has been put on a U.S. government watch list. Her boyfriend, Stephen Paddock, left, carried out the Las Vegas shooting - the deadliest in U.S. history

Two federal law enforcement officials tell ABC News that Danley has been designated a U.S. Transportation Security Administration 'selectee'.

That means that authorities will be notified if Danley boards any flight or tries to cross a U.S. border.

The designation will show up as a special code on her boarding pass, notifying TSA agents to perform extra screening and to tip off authorities about her travel plans.

Danley was in her native Phillipines when her boyfriend carried out the massacre last week.

Authorities grew suspicious of her possible part in the shooting after they discovered that Paddock had wired her $100,000 before carrying out the attack.

Danley is pictured above returning to the U.S. to speak with investigators after the shooting. They don't think she was involved, but are keeping an eye on her nonetheless

But Danley quickly returned to the U.S. to speak to authorities, proclaiming her innocent and telling investigators that she was ignorant of his plan.

She says when Paddock bought her a last minute ticket to the Philippines and wired her the money, she thought it was his way of breaking up with her.

'I knew Stephen Paddock as a kind, caring, quiet man,' Danley said in a statement read by her attorney last week. 'I loved him and hoped for a quiet future together with him.'

Danley added that Paddock 'never said anything to me or took any action that I was aware of that I understood in any way to be a warning that something horrible like this was going to happen'.

'I am devastated by the deaths and injuries that have occurred and my prayers go out to the victims and their families and all those who have been hurt by these awful events,' Danley said.