By Denise Lavoie, Associated Press
BOSTON (AP) - The brother and stepfather of a Massachusetts Institute of Technology police officer killed by Boston Marathon bomber Dzhokhar Tsarnaev say his death had a devastating impact on their family.
Officer Sean Collier was shot to death by Tsarnaev and his brother, Tamerlan, as they tried to flee the Boston area three days after the bombings. Tsarnaev was convicted in the bombing and Collier's killing.
Collier's stepfather testified Wednesday that Sean's mother was so distraught by his death that she couldn't get out of bed for months.
His brother says Sean had had a strong sense of right and wrong since he was a young child and always wanted to be a police officer.
Three people were killed and more than 260 were injured in the 2013 bombings.
