A federal grand jury has subpoenaed the wife of dead Boston Marathon bombing suspect Tamerlan Tsarnaev in connection with an investigation into a 2011 triple homicide in Waltham, the Associated Press reports:

The attorney for the wife of the dead Boston Marathon bombing suspect says a federal grand jury asked her for items that belonged to one of the victims in a triple slaying in a Boston suburb nearly three years ago.

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The attorney for Tsarnaev's widow, Katherine Russell, says a grand jury asked her for items that belonged to Brendan Mess, one of the three people killed in the Waltham triple slaying and a friend of Tsarnaev's. Attorney Amato DeLuca says Russell doesn't have anything that belongs to Mess.

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Authorities believe Tsarnaev may have helped kill the three men with Ibragim Todashev, the Florida man shot by an FBI agent after he allegedly attacked interrogators with a knife.