Dzhokhar Tsarnaev contributed to his brother 's death , indictment says . Counts involve alleged use of weapons of mass destruction and killing of MIT officer . Indictment : Hours later , they drove their Honda Civic to the MIT campus , where they shot and killed officer Sean Collier and attempted to steal his service weapon , the indictment says . IEDs were made from pressure cookers , explosive powder , shrapnel , other items . Boston Marathon bombing suspect Tamerlan Tsarnaev was killed in a shootout with police on April 19, 2013 after he allegedly opened fire at the marathon finish line during an event that left three people dead and more
Dzhokhar Tsarnaev contributed to his brother 's death , indictment says . Counts involve alleged use of weapons of mass destruction and killing of MIT officer . Indictment : IEDs were made from pressure cookers , explosive powder , shrapnel , other items . Boston Marathon bombing suspect Tamerlan Tsarnaev was killed in a shootout with police on April 19, 2013 after he allegedly opened fire at the marathon finish line during an event that left three people dead and more