Stephen Morrison died last month
The 30-year-old from Plaistow was stabbed to death in a car park in Epping New Road on Tuesday, 23 June.
Essex Police has said a 17-year-old boy was arrested in Golders Green yesterday and he remains in custody for questioning.
Detective say their investigation are progressing but they still want to hear from witnesses or anyone with information.
Essex Police can be contacted on 101, quoting crime reference 1191 of 23 June, or information can be submitted online to the Major Incident Public Portal.
Those who wish to remain anonymous can contact the independent charity Crimestoppers on 0800 555 111 or via the Crimestoppers website.
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