Svenson Ong-a-Kwie fell through a conservatory roof as police swooped on a house in Dagenham.
Jodie Chesney murder trial
Detective Inspector Perry Benton explains how the Met Police caught Jodie's killers.
Following the verdict, Jodie’s sister Lucy Chesney said she is now "dreading my life rather than looking forward to it".
In a victim impact statement she wrote:
Jodie was not only my sister she was my best friend. Losing her is like losing half of myself. We went through everything together and she was always there for me and always putting everyone before herself. She gave me a type of love I will never feel again.
In an impact statement, Jodie Chesney's father said his daughter's murder had "destroyed my life".
"The full extent as to how this has affected my family and me cannot possibly be explained simply in words.
"I have no idea how I am going to continue with my life or even come to terms with the loss," he said.
Polcie have released a mug shot of Svenson Ong-a-Kwie, one of the two people found guilty of Jodie Chesney's murder.
Case officer Det Insp Perry Benton said only the people in the car "know why they went there".
"They are drug dealers. It's a business to them.
"They don't care about the lives ruined, whether it is class A or class B," he said.
Speaking about the case, DCI Dave Whellams said it remains a mystery why Jodie Chesney was killed.
"Svenson was wanting retribution on someone dealing on his turf. He has gone down to the park with (the 17-year-old) to cause some harm to somebody.
"Quite why it was Jodie, we don't really know.
"There is talk it could be another female drug dealer that operated in the park."