A murder case against an 18-year-old accused of stabbing a boy with a ceremonial dagger has been dropped.
Ashley died two hours after he sustained four stab wounds
Prosecutors said they had no evidence against Mohammed Alim, of Newham, east London, after a jury failed to reach a verdict, it was revealed on Tuesday.
Ashley Hedger, 16, was stabbed to death in Plaistow on 16 January this year.
Albab Chowdhury and Amran Siddik were cleared of his murder last month and Raju Rahman was discharged by the judge. All four had denied murder.
Prosecution counsel had earlier told the court the attack on Ashley was in revenge for an attempted robbery on an attacker by Ashley's friends, just a few minutes before.
The court had heard Ashley died of his injuries in hospital after suffering four stab wounds, including one to the heart.