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Witness Ready to Testify That Boston Bombings Suspect Knew Brother Was Involved in 2011 Triple Homicide, Court Docs Say

Tsarnaev's lawyers may try to argue their client fell under the murderous influence of his late brother, legal experts said.

FILE - This combination of file photos shows brothers Tamerlan, left, and Dzhokhar Tsarnaev, suspects in the Boston Marathon bombings on April 15, 2013. A Friday, Oct. 10, 2014 filing by the defense says a prosecution witness against Dzhokhar Tsarnaev is prepared to testify that Tsarnaev knew his older brother Tamerlan was involved in a 2011 triple slaying, according to a filing by attorneys for the surviving brother. Tsarnaev has pleaded not guilty in the 2013 bombings that killed three people and injured about 260 others. (AP Photos/Lowell Sun and FBI, File) AP Photos/Lowell Sun and FBI, File

BOSTON (TheBlaze/AP) — A prosecution witness against Boston Marathon bombings suspect Dzhokhar Tsarnaev is prepared to testify that Tsarnaev knew his older brother Tamerlan was involved in a 2011 triple slaying, according to a filing by attorneys for the surviving brother.

This combination of file photos shows brothers Tamerlan, left, and Dzhokhar Tsarnaev, suspects in the Boston Marathon bombings on April 15, 2013. (Image source: AP/Lowell Sun and FBI, File)

The defense seeks several items from prosecutors, including any evidence linking Tamerlan Tsarnaev to the gruesome slayings in Waltham, Massachusetts, where the bodies of three men were found with their throats slit and sprinkled with marijuana. The information was disclosed in the filing by the defense late Friday.

"Simply put, information and evidence tending to show that Tamerlan Tsarnaev participated in a triple homicide in 2011, and information depicting the brutality of those murders, is critical to the defense case in mitigation," lawyers said in their filing. "Such evidence would tend to corroborate Tamerlan's dominant role in the charged offenses and would place the brothers' respective personal characteristics and relative culpability into stark relief."

[sharequote align="center"]"Such evidence would tend to corroborate Tamerlan's dominant role in the charged offenses."[/sharequote]

Tsarnaev has pleaded not guilty in the 2013 bombings that killed three people and injured about 260 others. Tsarnaev's lawyers may try to argue their client fell under the murderous influence of his late brother, legal experts said.

Defense lawyers said that "even the government has conceded" that evidence concerning the older brother's participation in the Waltham killings might be relevant if Dzhokhar Tsarnaev was aware of it.

Prosecutors have previously declined to provide information on the Waltham case, saying it could jeopardize the investigation.

In court papers filed in October 2013, federal prosecutors acknowledged that a friend of Tamerlan Tsarnaev told investigators that Tamerlan participated in those unsolved killings. That man, Ibragim Todashev, was shot to death by authorities while being questioned in Florida.

Tamerlan Tsarnaev, 26, died in a gun battle with police a few days after the deadly Boston bombings.

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