Las Vegas shooter Stephen Paddock was generous with his gambling spoils, condescending to his girlfriend and strident about his constitutional right to own firearms.
Those were the observations of Brisbane businessman Adam Le Fevre, who spent time with the man who would go on to become the perpetrator of the worst mass shooting in modern American history.
Mr Le Fevre, the former partner of Ms Danley's sister, told A Current Affair on Friday that he went on a holiday to Las Vegas with Paddock, who put the group up in a hotel penthouse that was one of his perks for being a "high-roller".
Another perk, Paddock told Mr Le Fevre, was access to free call girls. "I did have no doubt that some of those offers had been accepted," he said.
He said the shooting puts a disturbing perspective on exchanges with Paddock that seemed like oddities at the time, such as his tour of the gunman's modest Mesquite, Nevada home.
"As we walked through, Steve said, 'Bedroom, lounge room, gun room...' Gun room?" Mr Le Fevre said.
"And he said, 'Well most people in the US have firearms and they need to be protected, and of course you don't want firearms falling into the hands of the wrong people'.
"Retrospectively, I wish I would have picked up on that earlier."
In subsequent conversations about gun laws, Paddock was forceful on the constitutional right to bear arms.
"He was very strict and very firm on the fact that it is a right... and it is the freedom of every American resident and person to participate, to own a gun and use it as seen fit where need be and that law should never be changed... I left that well alone from there on."
Paddock turned his arsenal of weapons on revellers at the Route 91 Harvest country music festival on Sunday night, killing 58 people and injuring about 500.
Investigators are still searching for a motive. Ms Danley, 62, said in a public statement that she had no clue that her partner was contemplating such an act.
She was in the Philippines when it occurred, saying Paddock had bought her the ticket two weeks earlier and later wired her $100,000, which she feared at the time was his way of breaking up with her.
Mr Le Fevre said Ms Danley came from a loving Catholic family and he had no doubt she would have raised the alarm if she had known what was to occur.
But the relationship between Paddock and Ms Danley was "not what I saw as a loving, caring relationship".
"I experienced Stephen talking to Marilou in a bit of an abrupt manner at times, and Liza and I away from them had questions as to whether everything was smooth sailing between them.
"Marilou, as I said a lovely girl, seemed very nervous and jittery around Steve. He would talk in a more of a condescending way at times and I, whilst concerned, was prepared to dismiss it as to be, 'That's his nature'."
But Paddock was generous towards Mr Le Fevre during his visit to Las Vegas.
"We were spoilt and I've never experienced anything like it before or since," he said.
Police are now investigating whether Paddock conducted his massacre with the help of an accomplice.
Mr Le Fevre's assessment of Paddock would not preclude that possibility.
"The planning that has gone into this terrible, horrible occurrence has been nothing other than military precision and that does not surprise me with Stephen Padfock because everything he did seemed to be with precision planning," he said.
On Saturday, the New York Times revealed that a note found in Paddock's hotel room was not a suicide note but contained numbers that police were now analysing.