Video footage shows the dramatic moment Jodie Chesney's killers were arrested in a Dagenham garden after one of them fell through a roof.
Drug dealer Svenson Ong-a-Kwie, 19, and his 17-year-old runner Arron Isaacs were involved in a "tit-for-tat vendetta" with rivals when they killed Jodie by mistake.
The popular 17-year-old student had been relaxing with friends in Amy's Park in Harold Hill, east London, on the evening of March 1 when two shadowy figures emerged from the dark and one knifed her in the back.
She screamed and collapsed in the arms of her boyfriend, Eddie Coyle, 18, as her attackers made off in a fellow drug dealer's car.
Svenson Ong-a-Kwie, 19, burnt his clothes and disposed of the knife he used to stab the Girl Scout immediately after the attack.
He had been lying low at the home of 17-year-old Arron Isaacs' uncle in Dagenham, east London, when police swooped to arrest them both on the evening of March 10.
When police arrived, they heard a commotion outside and an officer shouted: "Around the back."
In police body-worn video, Ong-a-Kwie can be seen clambering over a rear flat roof and crashing into the conservatory below.
An officer shouted: "Stay where you are. Show me your hands now. Get over here now."
As he was handcuffed, an officer confirmed to colleagues that he was "detained".
When told he was arrested on suspicion of murder, Ong-a-Kwie said: "What? Murder? I killed no-one."
Meanwhile, Isaacs had escaped through a window but was apprehended in the back garden with a rucksack containing a deadly Rambo-style knife.
He was initially arrested on suspicion of assisting an offender but later also charged with Jodie's murder.
The footage was released by the Metropolitan Police as Ong-a-Kwie was jailed for at least 26 years and Isaacs was locked up for at least 18 years for their part in Jodie's death.
