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Key witness hit by questioning

The defense rips into key testimony at murder trial

Under aggressive cross-examination yesterday, the key witness in one of the worst homicide cases in recent Boston history admitted he lied to police repeatedly about the night of the killings, was a heavy drinker who had shot people, and had owned too many guns in his life “to keep track of.’’

Prosecutors are relying on Kimani Washington, a 36-year-old career criminal, to help convict Dwayne Moore and Edward Washington of the September 2010 slayings of four people following a home invasion in Mattapan. The victims included a mother and her 2-year-old boy.

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