article_snippet: Dzhokhar Tsarnaev is charged with 30 counts related to the April 15, 2013, bombings that killed three people and wounded more than 260 others.
article_snippet: A fourth person, an MIT police officer, was ambushed and killed in A fourth person, an MIT police officer patrol car three days after the bombings as Dzhokhar Tsarnaev and A fourth person, an MIT police officer brother, Tamerlan, allegedly ran from police.
article_snippet: Tamerlan Tsarnaev, 26, was killed after a gunbattle with police.
article_snippet: Tsarnaev's connections: Who's who .
article_snippet: Dzhokhar Tsarnaev's defense has argued that Dzhokhar Tsarnaev indeed participated in the bombings, but that Dzhokhar Tsarnaev was influenced by Dzhokhar Tsarnaev radicalized brother.