article_snippet.sent: Tamerlan was killed in a police firefight a few days after the bombing, which Tamerlan masterminded.
article_snippet.sent: brother Tamerlan (right) drove his brother Tamerlan
article_snippet.sent: (right) brother to help his brother Tamerlan (right) with the 2013 killings . '
article_snippet.sent: One of the first defense witnesses to testify in the penalty phase described an incident at a mosque when  Tamerlan became angry and interrupted prayer services.
article_snippet.sent: phase by arguing that, when it came to planning the attack and . building the bombs, 'Tamerlan did that.'
highlights_snippet.sent: Lawyers have said that Tamerlan drove Tamerlan brother into the bombings .