Victim Billy McCullagh. Picture: Met Police (Image: Archant)
An Islington man has been arrested on suspicion of murdering Billy McCullagh in Stonebridge.
Billy, 27, was found with a fatal gunshot injury to his chest in Windrush Road just after 3am on July 16.
A 32-year-old man was arrested at an address in Islington this morning (August 21).
A 19-year-old man and a 24-year-old were arrested on suspicion of murder on July 16.
They have been bailed to return to a date in October.
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