How the case collapsed
But halfway through the trial, on 22 December, the prosecution's case began to unravel.
The jury saw extraordinary scenes when a prosecution witness, Marcus Smith, unexpectedly provided an alibi for Young and Trott for the night of the shooting.
It prompted the prosecution to offer no evidence against the two men and the judge to direct that the pair be acquitted.
Judge Gordon later told the jury Smith had lied to the police before giving evidence, changing his story during the trial.
While Osadebay and Siamino remained in the dock still charged with murder, the acquittals of their co-defendants prompted their own lawyers to apply for the case to be thrown out based on insufficient evidence.
Two days of legal arguments at the Old Bailey last week saw them accuse the prosecution of having made a catalogue of serious mistakes during presentation of the case, telling the judge all the evidence against Osadebay and Siamino was entirely "circumstantial".
This included being unable to provide sufficient proof either defendant had been driving the Ford Kuga – said to be a shared "drug pool" car – at the time of the shooting, nor had been using an implicated mobile phone also said to be shared.
The judge also agreed with the defence that social media accounts under Osadebay's name, in which the prosecution said he publicly threatened revenge for the theft of his jewellery moments before the killing, could not be proven to be his.
Judge Gordon told the jury: "Your time has not been wasted. It's only when you get to this stage that matters can really be got into and tested by the adversarial system."