Tsarnaev Widow Subpoenaed in Waltham Slayings

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:

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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.