A Las Vegas prostitute who was hired by murderer Stephen Paddock has spoken out about their "violent" sex sessions and how he bragged about having "bad blood".

The woman, who spoke anonymously, said she would spend hours drinking and gambling in Sin City with Paddock, who she described as "paranoid" and "obsessive", according to the Daily Mail.

If he hit a winning streak, he would take her back to his room for "really aggressive and violent sex" including living out rape fantasies, she said.

This 1979 photo shows Benjamin Hoskins Paddock, the father of Stephen Paddock, the gunman who killed dozens of people and injured hundreds at a music festival in Las Vegas. Photo / AP
This 1979 photo shows Benjamin Hoskins Paddock, the father of Stephen Paddock, the gunman who killed dozens of people and injured hundreds at a music festival in Las Vegas. Photo / AP

Paddock also boasted about his bank-robber father, saying that "the bad streak is in my blood" and "I was born bad", according to texts seen by the Sun on Sunday.

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The 27-year-old woman said Paddock, 64, would often rant about conspiracy theories including how 9/11 was orchestrated by the US government.

The escort, who said Paddock paid her US$6000-a-time for their meetings, also had texts in which he described tying her up "while you scream for help".

She spoke out after family members revealed that Paddock often consorted with prostitutes who were laid on by hotels while he paid regular visits to the city.

Officials close to the investigation into the shooting revealed that Paddock may have hired an escort in the days before the massacre.

A receipt from Paddock's hotel room showed two people ordered room service in the days before the attack.

Meanwhile investigators said they are interviewing other call girls in the hope of ascertaining a motive for the worst mass shooting in American history.

In Paddock's room, officials found a piece of paper containing several phone numbers but they reiterated no suicide note was found.

Law enforcement have said they are "confident" Paddock carried out the Mandalay Bay massacre from his hotel room alone.

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Las Vegas Metropolitan Police Department Undersheriff Kevin McMahill said on Friday that investigators are sure no one else was in the room before he shot dead 58 and injured almost 500 on Sunday.

Leaked photographs from inside the hotel room used by Las Vegas shooter Stephen Paddock in the Mandalay Bay Hotel showing his arsenal of weapons. Photo / Twitter
Leaked photographs from inside the hotel room used by Las Vegas shooter Stephen Paddock in the Mandalay Bay Hotel showing his arsenal of weapons. Photo / Twitter
Leaked photographs from inside the hotel room used by Las Vegas shooter Stephen Paddock in the Mandalay Bay Hotel showing his arsenal of weapons. Photo / Twitter
Leaked photographs from inside the hotel room used by Las Vegas shooter Stephen Paddock in the Mandalay Bay Hotel showing his arsenal of weapons. Photo / Twitter

Earlier, NBC News had reported a mysterious charger that did not match any of Paddock's cellphones - raising the possibility that another person had been with Paddock beforehand.

However, later police said that they have now matched all the cellphones and all the chargers and that they belonged to Paddock.

It was earlier revealed that Benjamin Paddock, Stephen's father, was an FBI most-wanted bank robber and con man known as "Big Daddy".

Benjamin was captured in Las Vegas in 1960 - then escaped and lived on the run for a decade.

FBI wanted poster of Benjamin Hoskins Paddock, left, and a 1977 file photo of Paddock, who went by the name Bruce Ericksen. Photo / AP
FBI wanted poster of Benjamin Hoskins Paddock, left, and a 1977 file photo of Paddock, who went by the name Bruce Ericksen. Photo / AP

He was described as psychopathic, armed and dangerous and suicidal - and the public were told not to approach the man known as "Chromedome" and "Old Baldy".

Stephen was just seven years old and living in Arizona when his father Benjamin Paddock was nabbed by the FBI for a series of bank robberies.

At the time, Stephen's mother tried desperately to shield her young son and his three siblings from the devastating news that their father was living a double life as a bank robber and con man.

"We're trying to keep Steve from knowing his father is held as a bank robber," a neighbour told the Tucson Daily Citizen on July 29, 1960. "I hardly know the family, but Steve is a nice boy. It's a terrible thing."