George Koh, 24, murdered well-known fashion model Harry Uzoka, 25, after arranging a fight on social media.
Shocking CCTV footage showed Koh chasing down Harry in Shepherd's Bush, West London, on January 11 with two accomplices.
The court heard how the pair rowed after Koh bragged about having sex with 25-year-old Mr Uzoka's girlfriend, Ruby Campbell, who is also a model.
She did not give evidence at the trial but has taken to social media to break her silence after receiving "multiple death threats".
In an Instagram post accompanying a picture of her and Mr Uzoka, she insisted she has never met Koh, who stabbed her boyfriend in the heart while she was away working in Los Angeles and Sweden.
She wrote: "Harry died because a man had a jealous obsession with Harry. He came to his house with his two friends, knives and intentions to kill.
"Since this event has happened I'm so sad and heartbroken. I had finally found someone I was so happy with and he was taken from me."
Ms Campbell said the tragedy has been "twisted to make it seem like I was the bad guy in this situation or this was a fight about me".
He post added: "This makes me so sad. I have had a hard time this year grieving and I am still grieving.
"Harry was my love. I have never lost a person in my life and I'm receiving multiple death threats and multiple social media accounts using a tragedy as click bait."
Along with Merse Dikanda and Jonathan Okigbo, both 24, the killer took at least three knives, including a machete.
Harry was cornered behind a red Volkswagen before being stabbed in the heart. He later died on the pavement outside his home as the trio fled the scene.
Koh was found guilty of murder following a four-week trial at the Old Bailey.
Dikanda was also convicted of murder whilst Okigbo was found guilty of manslaughter.
The pair had been locked in a bitter dispute after Harry became annoyed with the less successful Koh, who he believed was trying to copy his "look".
On January 11, Harry and his flatmate Adrian Harper arranged to meet Harry for a confrontation and armed themselves with dumbbell bars.
Juror heard how Harry was signed to Premier Model Management at the time of his death and had appeared in campaigns for Everlane and GQ whilst Koh had been on the books at IMG Models.
The pair first crossed paths at an Agi & Sam fashion show in 2015 where Harry gave a group of younger models – including Koh – modelling tips.
After meeting again at an Urban Outfitters shoot shortly after, Harry agreed to look through Koh's portfolio and recommended he should "go to a better agency".
They then followed each other on Instagram and occasionally bumped into each other in London or Paris.
But Harry began to grow "annoyed" that his "less successful" lookalike was trying to mimic him and make contact with some of his friends.
The relationship deteriorated further after French model Annecetta Lafon arrived in London at the end of December last year.
She told the court Koh "harassed" her for sex after inviting her to stay at his place before quizzing her about other models she had met in London.
The model added: "He said he used to be friends with Harry and he f**ked his ex-girlfriend."
She then went to stay with Harry, who she said was "laughing" when she relayed Koh's claims.
Koh then sent Harry an Instagram message reading: "Where you? I'll come there. We can fight. Bring your friends with you."
Within 10 minutes, Harry had responded, telling him to "come Shepherd's Bush".
Koh insisted he only recruited Dikanda and Okigbo because he was scared of being attacked by Harry and his friends and he had no intention of actually fighting.
When the groups faced off he told jurors he pleaded: "This is ridiculous – we could be brothers. This is over a girl."
Koh then claimed he only took the machete out to "scare" Harry and Mr Harper away and sobbed in the witness box as he added: "All I was doing was defending myself. In the course of it I killed Harry and I'm sorry for that."
But jurors saw through his lies and he was convicted unanimously of murder.
All three were remanded in custody ahead of sentence on September 21.
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