Police have released a photograph of Kyle McDonald, one week after the 19-year-old was shot dead in a street in Battersea. Police are asking witnesses to contact them.
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The property developer painted the mews house in March last year after she was denied permission for a basement below the property.
Profits at the estate agent plummeted 42% in the first half of the year.
Ionut Gheorghe, 27, was detained in Los Molinos near Madrid on Friday by Spanish police under a European Arrest Warrant.