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If triple killing had been solved, some say, Boston Marathon bombing could have been prevented

FILE - This combination of file photos shows brothers Tamerlan, left, and Dzhokhar Tsarnaev, suspects in the Boston Marathon bombings on April 15, 2013. Tamerlan Tsarnaev died after a gunfight with police several days later, and Dzhokhar Tsarnaev, was captured and is held in a federal prison on charges of using a weapon of mass destruction. A year after the bombings, prosecutors said they have a trove of evidence to use against Dzhokhar Tsarnaev, including surveillance video showing him placing one of the bombs just yards from Martin Richard, the 8-year-old boy who died in the blast. (AP Photos/Lowell Sun and FBI, File)

FILE - This combination of file photos shows brothers Tamerlan, left, and Dzhokhar Tsarnaev, suspects in the Boston Marathon bombings on April 15, 2013. Tamerlan Tsarnaev died after a gunfight with police several days later, and Dzhokhar Tsarnaev, was captured and is held in a federal prison on charges of using a weapon of mass destruction. A year after the bombings, prosecutors said they have a trove of evidence to use against Dzhokhar Tsarnaev, including surveillance video showing him placing one of the bombs just yards from Martin Richard, the 8-year-old boy who died in the blast. (AP Photos/Lowell Sun and FBI, File)  (The Associated Press)

Nearly three years after three men were found dead in a suburban Boston home, their families are still waiting for authorities to say whether one of the Boston Marathon bombing suspects was involved.

Federal prosecutors in Boston revealed in court documents months ago that a friend of bombing suspect Tamerlan Tsarnaev (tsahr-NEYE'-ehv) told authorities they participated in the killings in Waltham (WAHL'-tham). But state investigators have not released any information.

That friend was shot and killed by an FBI agent last May in Florida after authorities say he charged at a Massachusetts trooper.

Tamerlan Tsarnaev was a friend of one of the slaying victims. He died following a gun battle with police several days after last year's bombing. His younger brother, Dzhokhar Tsarnaev (joh-HAHR' tsahr-NEYE'-ehv) is awaiting trial in the bombing.