Listen now | Eleven years ago today, the Boston Marathon bombing shocked America, leaving an indelible mark on the nation's history. However, this tragic event is not the only unsolved mystery connected to the Tsarnaev brothers, who were responsible for the bombing. On September 11, 2011, three men were brutally murdered in Waltham, Massachusetts, in a crime that remains unsolved to this day. The older Tsarnaev brother, Tamerlan, is suspected of being involved in these murders.