Victim was stabbed in back in 'dirty water row' between neighbours on Isle of Dogs
Victim Sultan Ahmed had his back to his attacker and represented no danger when he was stabbed to death in a dispute over dirty water, the Old Bailey heard.
Shofique Uddin, 51, denies murdering the 20-year-old in Larson Walk on the Isle of Dogs on May 29 last year.
Ed Brown, for the prosecution, said Sultan was unarmed and trying to get a dha - a type of machete - away from Uddin's wife, Gulbahar Begum, 48, when he was stabbed in the heart from behind by her husband.
He said Sultan's role was shown in video of the events taken on a mobile phone.
"In all the footage Sultan Ahmed is the peacemaker and engages with the second defendant in that role and he doesn't engage with the first defendant at all," said Mr Brown.
"He did not represent a danger when he was stabbed in the back."
The prosecutor said there was no justification in self-defence as only the two defendants were armed, according to the footage.
Mr Brown also poured scorn on a previous explanation put forward by Uddin that he slipped, causing him to stab the victim.
"The knife went 18-19cms depth to reach the heart with the strength of a punch," said the prosecutor.
"He plunged the knife deep into the back of a young man who at most was trying to rid the second defendant of that terrible weapon. Shofique Uddin killed him and those are the facts of this case."
Begum, 48, denies two charges of wounding with intent. However, Mr Brown said she was calculated in her actions, which saw her swing the dha and injure two men in a simmering dispute between neighbours.
"There's a body of evidence that demonstrates she went into the house and chose and delivered the knife to her husband to use," he said.
"Also she decided to find and use an equally dangerous weapon. There's evidence she was shouting and screaming aggressively. She just might have killed somebody as well."
A third defendant, daughter Rahela Begum, 28, is charged with actual bodily harm after biting a man in the attack.
The fight stemmed from an argument over dirty water seeping into Uddin's garden after neighbours had washed carpets.
The trial continues.