'No one can put the puzzles together. No one except Marilou': Sisters of Las Vegas gunman's girlfriend break silence

The sisters of the Las Vegas gunman's Australian girlfriend, Marilou Danley, have broken their silence and say she holds the key to shedding light on the motive behind the deadliest mass shooting in modern US history.

More than 50 people were killed and more than 500 injured when Nevada man Stephen Paddock, 64, fired on people at the Route 91 country music festival from his 32nd floor room at the Mandalay Bay hotel late Sunday evening local time.

Marilou Danley, an Australian woman initially sought in relation to the Las Vegas shooting. She was overseas at the time and is not believed to be involved. Photo: Facebook

Marilou Danley, an Australian woman initially sought in relation to the Las Vegas shooting. She was overseas at the time and is not believed to be involved. Photo: Facebook

Ms Danley's two sisters, who live on the Gold Coast, insist their sister had no idea of the horror Paddock was plotting.

"No one can put the puzzles together. No one except Marilou," one of her sisters said. "Because Steve is not here to talk anymore. Only Marilou can maybe help out."

The sisters, who spoke to Channel 7 on Wednesday evening on the condition of anonymity, said Ms Danley, was sent to the Philippines by Paddock, in the weeks before the deadly massacre so she did not interfere his plans.

"He sent her away so that he can plan what he is planning without interruptions," the sister said.

Mr Paddock then wired than $100,000 to the Philippines, a law enforcement official said.

"She didn't know she was going to the Philippines until Steve said "Marilou I found you a cheap ticket to the Philippines," one of her emotional sisters said.

The two sisters, who repeatedly broke down during the interview, said their hearts were broken for the 59 victims of the massacre.

They say their sister was "madly in love" with Paddock and will be forever haunted by what her partner has done.

"She probably was even more shocked than us, because she is closer to him than us," her sister said.

"To be able to find out the person you love and live with can do such a thing and you thought you knew the person yourself."

"She is a good person and gentle soul. She is a mother, a grandmother, a sister and a friend."

"He [Paddock] has done this solely himself."

In the immediate aftermath, Ms Danley's image was broadcast around the world, sparking a global manhunt after it was revealed she had lived for years alongside the man who had committed the deadliest mass shooting in modern US history.

The Filipina woman, 62, is considered a "person of interest" in the investigation of the attack, Sheriff Joseph Lombardo of the Las Vegas Metropolitan Police Department said Tuesday afternoon.

Ms Danley who is Filipina and an Australian citizen, lived on the Gold Coast for more than a decade.

FBI agents investigating the Las Vegas mass shooting met Ms Danley when she arrived back in America on Wednesday afternoon (AEST).

This story 'No one can put the puzzles together. No one except Marilou': Sisters of Las Vegas gunman's girlfriend break silence first appeared on The Sydney Morning Herald.