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By Elizabeth Barber BOSTON (Reuters) - The older of the two brothers who carried out the Boston Marathon bombing was a controlling boyfriend who terrified his future wife's friends, a former roommate of the woman testified as lawyers fought to save the younger brother's life. Tamerlan Tsarnaev, 26, died four days after the April 15, 2013 attack that killed three people and injured 264. His younger brother, Dzhokhar Tsarnaev, last month was convicted of carrying out the attack and could be sentenced to death. The lawyers, who at the trial's opening in March conceded that Dzhokhar Tsarnaev had committed all the crimes of which he was accused, contend that Tamerlan was the driving force behind the bombing, with his younger brother coming along out of a sense of sibling loyalty.