Chilling CCTV shows the moment a vengeful ex-boyfriend and his family gather before the brutal killing of his love rival.
Daniel Grogan, 20, was driven jealousy and “self-serving anger beyond logic” as he plotted to kill Jay Sewell, 18.
Mr Sewell had been seeing Gemma Hodder, 18, after her relationship with Grogan ended.
Harrowing footage shown to the jury at the Old Bailey showed Grogan, his family and best friend gathering behind a row of cars before Mr Sewell was fatally ambushed in Lee, south east London.
The trainee recruited the group for a stand-off near their home in Eltham, south-east London, jurors were told.
In the clip, the group can be seen gathering in a park, before they start running towards the helpless victim armed with baseball bats, hammers and knives.
On December 11 2018, Ms Hodder drove from Kent to see Grogan, accompanied by Mr Sewell and some of their friends.
Grogan and his group armed themselves with knives, hammers, a 4ft fireman’s axe and wooden sticks and went to confront them, the Old Bailey heard.
Other CCTV footage captured the group battering Mr Sewell’s car with weapons and chasing his friend, Charlie Pamphlett, now 19, who was stabbed in the back but survived.
Mr Sewell was fatally stabbed through the car window, jurors were told.
Grogan was found guilty of murder, wounding with intent and violent disorder.
Jailing him for life with a minimum of 21 years, Judge Wendy Joseph QC said he “desired only revenge on Gemma and Jay” and was driven by “self serving anger beyond logic”.
She said: “He deliberately engineered a confrontation because he would not accept that Gemma wanted to be with Jay and not him.
“He was consumed with hatred and jealousy for a boy who had what he could not have, namely the affection of Gemma Hodder.”
His father Robert, 58, who wielded a large axe, was found guilty of manslaughter, wounding with intent and violent disorder.
Jailing him for 14 years and six months, the judge said he “lost control of himself” and acted out of character after being misled by his son.
His mother Ann, 55, who was found guilty of manslaughter and violent disorder, was jailed for seven-and-a-half years.
Her sentence was followed by a disturbance in the public gallery, and Mr Sewell‘s mother walked out of court saying it was “a joke”.
Friend and neighbour Charlie Dudley, 26, was jailed for 16 years for manslaughter, wounding with intent, and violent disorder.
Cousin Liam Hickey, 19, was locked up for three years for wounding with intent and violent disorder.