Stephen Morrison was killed in June
The 30-year-old was stabbed to death in a car park in Epping New Road on the evening of Tuesday, 23 June.
Essex Police has revealed that officers arrested a 20-year-old man from Twickenham yesterday on suspicion of murder.
Police say, of the 11 other arrests, three people have been told they will face no further action, while the other eight are currently on bail.
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Tags: Newham, Epping, Plaistow, Epping Forest