Desmond Brooks, 40, was remanded in custody when he appeared at Camberwell Magistrates' Court today charged with the murder of a woman and the attempted murder of two others in Brixton, south London.
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A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Seven people have now been arrested after a man died from serious head injuries
The 38-year-old officer was on his way home from a night shift when he collapsed. His death is not being treated as suspicious.