A fourth suspect has been taken into custody today following an incident in Poplar on Friday evening where a man was found fatally stabbed in the back.
All four of the suspects were arrested on suspicion of murder. The victim was named earlier as Liam Hamilton.
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The entertainer was held for the murder of Stuart Lubbock, who was found dead in his swimming pool in 2001, but never charged.
Although the diamond was believed to be cut in the 19th Century, its history and how it arrived at the car boot sale is unknown.