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(NEWSER)– Tamerlan Tsarnaev's involvement in a grisly 2011 triple murder is relevant to his brother Dzhokhar's trial if Dzhokhar knew about it, defense lawyers say—and a federal prosecution witness is prepared to testify that he did.

Court filings released Friday reveal that the surviving Boston Marathon bombing suspect's lawyers are pushing for government information on the slayings, which could help what appears to be a defense strategy of arguing that Tamerlan dominated his younger brother and bullied him into taking part in the attacks, Yahoo News reports.

The 2011 murders are still officially unsolved, and a friend who allegedly admitted taking part in the killings with Tsarnaev was shot dead by an FBI agent during questioning last year.

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