The moment murderer sprints down quiet street with Rambo-style knife in broad daylight

CCTV captured the chilling moment that crack cocaine dealer David Sisman murdered Lee Crewe in broad daylight and sprinted down a quiet Newport street with a Rambo-style knife in his hand. Sisman, 21, has been found guilty of murdering the unarmed 36-year-old.

There was a stark difference in how the footage was portrayed by the two sides in Sisman's Newport Crown Court trial. You can read more on that here.

Defence barrister Tom Crowther KC claimed Mr Crewe, "a much bigger man" was "dominating" Sisman as he stepped off the kerb and into the road where Sisman stood. But prosecutor Mark Cotter KC described the victim as "an unarmed and intoxicated man who was retreating" and who had not raised an arm or physically threatened Sisman.

The camera captured the murder shortly before 6pm on May 14 in Chepstow Road, Maindee, as well as the aftermath in which hooded Sisman sprinted along the residential street while still holding the "large, Rambo-style" knife he had driven into Mr Crewe's chest. The murderer would then dump the knife in the River Usk, the court heard. For the latest court reports, sign up here to our crime newsletter

Sisman admitted that he fatally knifed Mr Crewe — and that at the time he was selling drugs and carrying a knife in public — but he pleaded not guilty to murder on the basis of self-defence. Sisman claimed he was protecting himself from Mr Crewe, who was "a roiling cauldron of boastful fury", argued Mr Crowther.

The jury was unanimous in finding Sisman guilty of murder. During the trial, prosecutor Mark Cotter KC accepted that Mr Crewe "may have been verbally unpleasant" when he approached Sisman in the street. The prosecutor said that even if Mr Crewe was "a bit drunk and being a bit aggressive because he wants to get his hands on some crack cocaine and he can't pay for it", there was nothing to suggest he physically threatened Sisman.

Mr Cotter questioned Sisman's decision not to give evidence in the trial as well as his 'no comment' police interview. "If you were accused of murder and there was a true and simple explanation as to why you had driven a large knife into the chest of another man, well, wouldn't you be telling police that?" he asked the jury. "When it comes to your trial, wouldn't you be telling the jury your version of events?"

The prosecutor argued that the evidence about Mr Crewe's aggressive behaviour earlier that day did not "even begin to defeat the horror" of the stabbing, which was captured on CCTV. He pointed out that Mr Crewe had not raised a hand towards Sisman and had done "nothing physically threatening".

The defence barrister Mr Crowther argued that Mr Crewe's intent to rob Sisman was clear from a text message he sent minutes before the incident: "I'm jacking somebody." He also pointed to the cocktail of cocaine and alcohol ingested that day by Mr Crewe, who was "raging" like a "primal, alpha male, silverback gorilla", according to the barrister. He added that his client pulled out the knife "in the heat of the moment" and instinctively stabbed Mr Crewe because he feared for his own safety.

Sisman, of Hubert Road in Newport, had no previous convictions. Judge Daniel Williams told him: "The only sentence I can pass will be one of life imprisonment." He adjourned the case to November 28 for a pre-sentence report to be written. You can read the prosecution and defence's closing speeches from the trial here.

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