Mathieson - described as being his "normal self" - then dropped one of his children at his grandmother's before returning to the tidy family home in Falkirk with his younger son.
He sent a text to his girlfriend stating: "Have a good night. Love you".
But after returning home and putting his child to bed, Mathieson made a phone call and arranged sex while his partner was out.
Fatefully, Luciana Maurer was one of the escorts who arranged to meet him.
The Romanian born mum had just arrived in Scotland a few days earlier after moving from London.
The 23-year-old arrived Mathieson's home at around 11pm.
Within minutes, tragic Luciana was dead. Mathieson - high on cocaine - stabbed her 44 times - including slitting her throat.
Mathieson then sent a text to his partner saying: "Sorry xx".
The court heard Luciana had defensive-type injuries, suggesting she had tried to fend off her killer.
Two more vice girls Mathieson had contacted later arrived at his home - unaware of the bloodbath inside.
When they turned up, they could see Mathieson casually sitting on his couch in the living room.
He then cooly answered the door and lead the oblivious pair upstairs.
Describing the horror that then met them, Prosecutor Jane Farquharson said: "Mathieson went into the bedroom first.
"He put on the light and hung back at the door whilst the women walked in.
"As soon as they entered the bedroom, they saw the deceased, lying on her back on top of the double bed."
Crazed Mathieson then grabbed two knives from a set of drawers before blocking the door.
Both women froze in terror. One begged Mathieson to let them go - but he grabbed their mobile phones and tossed them away.
He first tormented the women by stroking them with the knives then threatening to kill them if they did not bow to his sick demands.
Miss Farquharson: "He told both to remove their clothing and to dance for him.
"In fear of what he might do and, with the body of the deceased lying on the bed in front of them, each did as they were told."
Mathieson went on to rape the pair - including attacking one after ordering her to lie beside Luciana.
The pair - aged 26 and 22 - were trapped in the bedroom for 10 minutes before he ordered them downstairs.
Once there, Mathieson continued to humiliate the petrified women and also raped them again.
Miss Farquharson said: "Over the course of the assault in the living room, he told them that his son was asleep in the bedroom upstairs.
"He appeared to have an awareness of what he had done advising both: 'I'm going to be many years in prison because I killed that girl.
"I've done this to show my wife something."
Mathieson then went to a window thinking his partner had returned. Sensing an opportunity to escape, the women raced for the door.
Mathieson gave chase - striking one on the leg with a knife - but the pair managed to get out in fear of their lives.
They ran to a nearby flat where a woman there came to their aid.
Miss Farquharson: "Both repeatedly stated their thanks and asked for help. They were crying and appeared to be terrified."
After the women escaped, Mathieson dialled 999 himself and told the operator: "I've been high on drugs and I've killed a prostitute.
"Tell the officers I am not aggressive. I'm sitting on the couch. I had two other girls, but I've let them go."
Mathieson was still sitting in his living room when police turned up. He got down on his knees and held out his hands when officers arrested him.
Around 2am, Mathieson's partner - clueless as to what had gone on in her absence - arrived back having enjoyed her night out.
Miss Farquharson explained: "On seeing the police presence, she was described as hysterical."
The hearing today was interrupted at one point as Mathieson began crying hysterically and loudly retching as if he was going to be sick.
In what is rarely seen in court, his QC Donald Findlay then left his own seat to sit beside Mathieson in the dock to speak to him briefly before the case continued.
No reason was given for the killing and rapes, but it is believed Mathieson's drug problem may have been a factor.
In the spring of last year, he had started attending Cocaine Anonymous having built up a large debt.
His girlfriend was not aware of the drug habit until finding out about the cash he owed.
Mr Findlay said, before these crimes, Mathieson had been of "impeccable character", but that he now accepted "full responsibility" for what went on.
Judge Lord Bannatyne deferred sentencing until May 7 in Livingston.
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