It was a very modern love affair for young mum Katherine Smith.
The 26-year-old thought she had met Mr Right, 46-year-old Anthony Lowe from Coventry, after joining dating website Plenty of Fish.
After a week, they got engaged.
It was a whirlwind affair. But it was not all as it seemed.
Lowe had lied about his age, and told Katherine his name was Tony Moore.
But it was the start of a drastic turn of events that would culminate in her death in her own flat in September 2017 - just six weeks after the pair started dating.
From the start, things were odd.
Soon after they started a relationship, Lowe became suspicious, not trusting Katherine, sending her persistent messages to check on her.
The night before Ms Smith died, the couple had been to Tongwynlais Rugby Club to play skittles with family and friends, but Lowe was in a bad mood, and didn't speak to Katherine in the car on the way home.
The pair were seen on CCTV arriving at her flat on Heol Trelai in the Ely area of Cardiff just before 10.25pm.
Lowe as seen to leave around 20 minutes later, during which time he murdered her.
On September 28, 2017, police attended Heol Trelai after a 999 call from her friend.
They found Ms Smith’s body and an orange kitchen knife with a nine and a half inch blade.
She had been stabbed 33 times - including in the neck, chest and heart - following a ferocious attack.
Katherine's mother Debbie first realised something was wrong after she wasn't able to get in touch with her daughter.
"We'd talk everyday, so I picked up the phone and rang it, and it just kept on ringing and ringing," she recalled.
"It went to answer phone, and I said that was really strange."
"I kept on phoning Kath's phone all the time, and left horrible messages on the phone, but I didn't know.
"I was phoning her friends to see if anyone had heard from her.
"Later I saw three people coming towards us, and my words to them were: 'Don't say anything has happened to her'.
"They just looked and I just screamed the place down."
After the murder, Lowe fled the scene, taking Ms Smith's car and headed towards Bristol and Bath.
While on the run, he sent messages to Debbie and friends - confessing to the murder and revealing his true identity.
While his phone was still on, police tracked his mobile to near Bristol Temple Meads train station.
However, detectives also found Lowe was near Clifton Suspension Bridge - a notorious suicide spot - and became worried he may try to jump off.
While officers raced to the scene, Lowe sent another text to Katherine's mum.
He told her: "You need to send the police to the flat because Kath is laying on the living room floor dead.
"Let the police go in first. I'm so sorry, but that won't make up for me killing your daughter.
"Well it's bye for me, I'm off to end my life now."
But just as police negotiators rang Lowe's phone, it suddenly was switched off.
Three calls went unasnwered.
Police feared the worst.
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Then, out of the blue, his phone pings near the seafront, in Weston-super-Mare.
Officers are redeployed and are told to wait for an order to act.
Lowe texts Ms Smith's mother again.
"What's going on?" it read. "Is she OK or not?"
Police suspect Lowe thinks his partner might be alive, a possible way in for negotiators.
Moments later police find Lowe, who is then followed by three officers in plain clothes.
As he tries to walk into a supermarket, detectives swoop in and grab him outside the entrance.
But he refuses to answer any questions during his police interview.
Instead, his solicitor reads out a prepared statement in which he denied stabbing or killing Ms Smith.
And he goes on to make the ridiculous claim he acted in self-defence - headbutting her to the face after she had punched him first - and that someone else must have killed Katherine.
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But police are tipped off that while on the run, Lowe had been contacting former partners.
And there were also chilling similarities in his behaviour to other women.
A former girlfriend said that he gave also her another name and would insist on going with her everywhere - even when she was having a bath.
And when she didn't reply to a text, he would become "aggressive".
In a voice memo to her, Lowe is heard saying: "You fat f***ing slag ****, I'm going to f***ing kill ya".
Fast-foward to Cardiff Crown Court the following March and the murky details of Lowe's criminal record came to light - 142 previous offences, including domestic violence.
He initially denied murder, but changed his plea on the second day of the trial.
Lowe was jailed for life with a minimum term of 18 years.
After Lowe was finally caged, Ms Smith's mother, Debbie paid tribute to her "beautiful, intelligent and caring" daughter .
"Even during her short life people told us how lovely a person she was," she said.
“We will never see her smile again. Our hearts are broken and nothing in this life will ever mend that.
“Parent should not bury their children and they should never have to be told their child has been killed at the hands of another person.
"She was 26 years old. The pain of telling my granddaughter that she would not see her mummy any more was unbearable.
"Anthony Lowe you have not just taken one life, you have taken my life, as I do not live now, I just exist.
"I always thought that monsters were just in movies, but now I know that monsters are real."
Code Blue: Murder is on ITV1 tonight at 9pm.
