Louise Porton (pictured) murdered her two young daughters because they interfered with her job as a sex worker and now faces life in jail

Chilling CCTV footage showing the tragic final moments of a three-year-old girl murdered by her own mother has been released after she was convicted of killing both her children.

Footage shows part-time model Louise Porton, 23, leading her daughter Lexi Draper into their home in Rugby, Warwickshire, hours before she suffocated her on January 15 last year.

Just 18 days later, she strangled 16-month-old Scarlett Vaughan. She killed both her daughters because they 'got in the way' of her job as a sex worker.

Clips from two weeks after Lexi had died show the single mother carrying Scarlett from a hotel in Rugby where she had been staying - with police suggesting she was already dead as she casually carried her through the lobby.

A clip from a petrol station the same day shows Porton stopping to fill her car up with fuel even as her Scarlett lay dead, or dying, on the back seat.

Porton, who earned a living sleeping with men she met online and sending them explicit pictures and videos, was today found guilty of two counts of murder.

Porton (pictured) resented her children 'getting in the way' of her job as a sex worker in Warwickshire

Porton claimed her daughters died naturally but acted 'like someone had lost their goldfish' when she was informed of their deaths

In a heartbreaking statement, Chris Draper, Lexi's and Scarlett's dad, said: 'When we lost Lexi we were heart broken and couldn't believe she had gone. Then we were devastated to hear about Scarlett.

'Only having a short time with Lexi and never meeting Scarlett makes it all the more heart breaking. We will miss out on all those special occasions they would have celebrated. Their first day at school, birthdays, getting married and having children of their own.

'The loss of Lexi and Scarlett has not just affected the immediate family, but also all those who were part of their lives. The only comfort is that Lexi and Scarlett are together. We would like to thank everyone for their support and help.'

Porton claimed her daughters died naturally but acted 'like someone had lost their goldfish' when she was informed of their deaths. She stood poker-faced as jurors returned verdicts after a four-week trial.

Jurors heard Porton had accepted 41 friend requests on a dating app just a day after the first child Lexi died, and was described by prosecutors as being 'calm and emotionless' following Scarlett's death.

When Lexi was ill in hospital, just over a week before she died, Porton took topless photos in the toilets and was arranging to perform sex acts for money with a man she had met through a website.

Lexi Draper (left) and Scarlett Vaughan (right) were murdered by their mother at the start of last year

Jurors were told that after police seized her phone, they uncovered searches including how long it took a dead body 'to go cold up to the shoulder' and 'five weird things that happen when you die'. Pictured: Lexi (left) and Scarlett (right)

Porton is pictured carrying Scarlett at the hotel. Police suggested that the little girl may have been already dead at this point as paramedics who treated her said she was 'freezing and completely lifeless' by the time they reached her

The 23-year-old suffocated Lexi in the early hours of January 15 last year and was then heard 'laughing' at a funeral parlour two days before killing Scarlett just over two weeks later, on February 1.

Prosecutors said it had appeared to a funeral arranger that Porton was 'using FaceTime and that she was speaking to a man'.

Jurors were told that after police seized her phone, they uncovered searches including how long it took a dead body 'to go cold up to the shoulder' and 'five weird things that happen when you die'.

Opening the Crown's case at the start of the trial, prosecutor Oliver Saxby QC said: 'The overwhelming inference is that Lexi and Scarlett died because someone deliberately interfered with their breathing. That someone can only have been this defendant.'

Both children had symptoms consistent with deliberate airway obstruction and Scarlett had signs of recent bleeding in her neck tissue, suggestive of neck compression, jurors heard.

Mr Saxby said specialist doctors could find no 'natural reason' for why either child had died.

Porton leads her daughter into her home the day before Lexi died. The killer has been convicted of both her daughters' murders

This CCTV footage shows Porton taken her two daughters home the day before one, Lexi, died

Almost two weeks before her death, Lexi had been taken to hospital on January 2 and then January 4, but was sent home with antibiotics for an apparent chest infection.

Prosecutors said that while in hospital with her sick daughter, Porton went to the toilets and took topless photos.

It was in the days after Lexi was discharged on January 4, the prosecution alleged the mother looked online for 'can you actually die if you have a blocked nose and cover your mouth with tape'.

Porton also searched 'how long after drowning can someone be resuscitated?' and accessed an article called 'Toddler brought back to life after nearly drowning', jurors heard.

The Crown alleged Lexi had been dead for some time before a 999 call was made from her home on January 15, with Mr Saxby pointing to evidence of Porton's web searches.

After Scarlett's fatal collapse, Porton told police it was 'entirely false' to suggest the toddler was already dead when she was recorded on CCTV carrying the little girl from a hotel, in Rugby, where she had been staying.

But the paramedic responding to the subsequent non-emergency 111 call Porton made, described the girl being 'freezing and completely lifeless' when he arrived.

CCTV showed Porton filling up with petrol during the period when jurors heard Scarlett had already died.

The first day of trial was told that from August 2016 until early November 2017, Porton lived at an address in Willenhall, near Walsall, where her landlady spent 'more and more time' caring for Lexi and Scarlett while their mother was 'doing social things' instead of looking after them.

The landlady made a statement to police saying Porton was doing 'whatever she could not to have them with her'.

Conceding that being a young mother of two young children would have placed a burden on the defendant, Mr Saxby added: 'No doubt, she would have needed time to herself.

'But, in the context of what was later to happen - in the context of two unexplained deaths consistent with deliberate airway obstruction - it is hard not to draw the conclusion that, for the defendant, at times, her two children got in the way of her doing what she wanted, when she wanted and with whom she wanted.'

Porton had denied wrong-doing throughout, telling police in a prepared statement: 'My children were never an inconvenience to me and I accommodated my lifestyle and personal life around them.

'I still don't know how my daughters died, or what caused it.'

Porton, formerly of Skiddaw, Rugby, Warwickshire, will be sentenced by Mrs Justice Yip on Friday.