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A man who tried to set fire to a sex worker and stabbed her repeatedly after he was unable to get an erection, is facing jail after he was snared by his vomit at the scene.

Kirk Wynter, 32, screamed 'you're dying in here' as he plunged the scissors into Samantha Jamison and hit her with a broken tile and an umbrella.

The crack cocaine dealer had already paid Ms Jamison for sex, but became irate when he was unable to get aroused, the Old Bailey heard.

He asked for his money back but when she refused, Wynter launched the terrifying attack leaving his victim with two punctured lungs, stab wounds, and severe bruising.

Wynter claimed it was a case of mistaken identity, but his DNA was all over the scene of the attack after he vomited moments before assaulting the woman.

Forensics officers ran the DNA profile through the police database and were able to identify Wynter, who was arrested at his home on June 27.

He was also recognised by a distinctive scorpion tattoo on his body, which he had proudly showed to Ms Jamison moments before trying to kill her.

A jury of nine men and three women found Wynter guilty of attempted murder by a majority of 11-1, having deliberated for nearly ten hours.

Judge Nicholas Hilliard QC, the Recorder of London, remanded Wynter in custody until his sentencing on September 1, but warned him to expect a lengthy jail term.

"You have been convicted of what appears to be strong evidence indeed", he told him.

"It can only be met by a long sentence of imprisonment to protect the public.

"I want a report from the probation service to determine the future risk the defendant poses to the public.'

Wynter displayed no emotion and hung his head as he was led away to the cells.

He carried out the attack in a store room in Bramfield Court, on the King's Crescent Estate, Finsbury Park, having picked up Ms Jamison on the street nearby.

He initially paid her £15 for oral sex behind a camper van, but could not maintain his erection.

(Image: PA)

Wynter returned later that evening, on June 21 last year, offering £40 if Ms Jamison would 'finish him off'.

When they reached the secluded store room, on the second floor of the estate, Wynter stripped off his shirt to reveal the scorpion tattoo among an array of distinctive body art, including one design which read: "Live for today, f*** tomorrow".

"She then began again to give him oral sex but his problem continued and he was unable to get an erection", said prosecutor Michael Hall.

Wynter abruptly ran to the corner of the dingy room to vomit, then put his shirt back on and demanded she return his money.

"At this point things got nasty", said Mr Hall.

"He picked up an umbrella and started striking her with it.

"He demanded not just the money he had given her but every penny she had."

Wynter grabbed a broken tile lying nearby and began hitting her with it, telling her: "You're dying in here b**** don't think you're getting out of it".

"She then describes how he tried to light her hair with his disposable lighter and with a candle but, largely due to her efforts, the flame didn't catch.

"He kept saying that she was dead", said Mr Hall, "and then, while holding her by the hair, emptied her make-up bag.

"A pair of scissors fell out which he picked up and started stabbing her repeatedly with.

"His face was screwed up as he said: 'You f***ing bitch, you're dying'."

Ms Jamison was stabbed repeatedly in the legs and chest as she struggle to get free, before Wynter fled the store room.

A desperate 999 call to emergency services was played to jurors, as Ms Jamison struggled to breathe and called out for help.

When he was arrested, Wynter told officers: "I swear on my kids life I didn't do that."

He maintained his defence throughout the trial, claiming another man had attacked Ms Jamison after he had sex with her.

Wynter, of Harold Road, Stoke Newington, denied attempted murder.

A lesser charge of wounding with intent to cause grievous bodily harm will lie on file.

He will be sentenced on September 1.