The suspect refused to meet agents and state troopers at a police station , insisting instead that they come to his Florida apartment . Sergei also knew the alleged Boston Marathon bombing mastermind . He was killed in Florida in May 2013 while being questioned about a triple homicide . Sergei 's family has denied that he posed any threat to law enforcement .
Sergei also knew the alleged Boston Marathon bombing mastermind . He was killed in Florida in May 2013 while being questioned about a triple homicide . Sergei 's family has denied that he posed any threat to law enforcement .