A Las Vegas sex worker said that Stephen Paddock was "paranoid", loved conspiracy theories and enjoyed violent rape fantasies.
He also boasted about his father being a criminal, telling her "I was born bad". He was also prone to go on rants about conspiracy theories, including one about 9/11.
Speaking anonymously to The Sun, the 27-year-old woman said Paddock asked her to take part in "violent" sex acts.
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The woman supplied texts to the newspaper in which Paddock fantasised about tying her up while she screamed for help.
It's reported that Paddock often had sex workers visit him at hotels when visiting Las Vegas for frequent gambling trips.
Police are currently looking to speak to any escorts who Paddock may have been with in the days before the massacre took place.
A receipt in Paddock's room at the Mandalay Bay reportedly showed two people ordered room service in the days before the mass shooting.
Paddock shot and killed 58 people at a country music festival on October 1 in the worst shooting in American history, before killing himself in his hotel room.