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April 22, 2013: Dzhokhar Tsarnaev, who was injured in the shootout, is charged in his hospital room with using and conspiring to use a weapon of mass destruction.

April 30, 2013: Two friends of Dzhokhar Tsarnaev are charged with attempting to destroy evidence by disposing of a backpack and laptop computer taken from his room after they found he was a suspect in the bombing. Another is charged with lying to investigators.

May 9, 2013: Tamerlan Tsarnaev is buried in an undisclosed location after a weeklong search for a cemetery willing to take the body.

May 22, 2013: An FBI agent in Orlando, Fla., fatally shoots Ibragim Todashev, a friend of Tamerlan Tsarnaev‘s, after he lunges at law enforcement officials questioning him about the Waltham killings. Officials say that before he died, he had agreed to give a statement about his involvement.

July 10, 2013: Dzhokhar Tsarnaev pleads not guilty to 30 federal charges.

July 23, 2013: Marc Fucarile is the last survivor of the bombings to leave the hospital.

Jan. 30, 2014: Prosecutors announce they will seek the death penalty against Dzhokhar Tsarnaev.

April 15, 2014: Ceremonies and events will mark the anniversary of the attacks.

April 21, 2014: The 2014 Boston Marathon will feature a field of 36,000 runners, 9,000 more than 2013. It will be the second-biggest field in the race’s history.