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Mattapan defense focuses on tipster

Unknown caller may undermine a key witness

By Maria Cramer

 |  Globe Staff  

  March 07, 2012

The lead detective in the Mattapan massacre acknowledged on the witness stand today that police did not test a key prosecution witness for gunshot residue when he was caught driving an SUV stolen from one of the victims. On the witness stand this afternoon, the homicide investigator, Boston Police Sergeant Detective John Brown, also read from a transcript of a tip that seemed to undermine the credibility of Kimani Washington, the prosecution’s key witness in the slaying of four people, including a 2-year-old boy, in September 2010.

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