Why Dzkokhar Tsarnaev's lawyers say his status as a new U.S. citizen shouldn't be used to argue his alleged "betrayal" is a reason he should be killed.

Federal prosecutors have asked a judge to limit Boston Marathon bombing suspect Dzkokhar Tsarnaev access to gruesome autopsy photos of the three people killed in the attack.

The trial of Boston Marathon bombing suspect Dzkokhar Tsarnaev is expected to last three months, plus another six weeks if he is convicted and jurors have to decide whether he should be put to death, prosecutors said Monday.