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Lawyers for convicted Boston Marathon bomber Dzhokhar Tsarnaev on Tuesday are set to probe his troubled family history as they make their plea for a jury to sentence him to life in prison rather than death. The 21-year-old ethnic Chechen was convicted earlier this month of killing three people and injuring 264 in the April 15, 2013, bombing, as well as shooting dead a police officer three days later alongside his older brother, Tamerlan Tsarnaev. Defense attorneys opened their case on Monday by arguing that 26-year-old Tamerlan, who died following a gunfight with police hours after the police officer's shooting, was the driving force behind the attack and that his younger brother had been raised to follow his lead. During the first day of defense witness testimony, the jury heard from people who had seen Tamerlan's outbursts at a mosque near his Cambridge, Massachusetts, home and from his mother-in-law, who described his growing obsession with religion.