Boston Marathon bombing suspect Dzhokhar Tsarnaev has been charged with using a weapon of mass destruction to kill - a crime that carries a possible death sentence. Officials have said Tsarnaev, 19, and his older brother set off the twin explosions at last week's race that killed three people and wounded more than 180. His brother, Tamerlan, 26, died Friday after a fierce gunbattle with police. Boston Marathon bombing suspect Dzhokhar Tsarnaev has been charged with using a weapon of mass destruction to kill - a crime that carries a possible death sentence. Officials have said Tsarnaev, 19, and his older brother set off the twin explosions at last week's race that killed three people and wounded more than 180. His brother, Tamerlan, 26, died Friday after a fierce gunbattle with police.