Boston Bombing Suspect Dzhokhar Tsarnaev Pleads Not Guilty

Boston Marathon bombing suspect Dzhokhar Tsarnaev insists he wasn't the one behind the horrific explosions in April that killed 3 people and injured 260 more -- pleading not guilty today in Boston federal court.

19-year-old Tsarnaev pled not guilty to 30 counts total -- including use of a weapon of mass destruction to kill.

Federal prosecutors are currently deciding whether to pursue the death penalty for Tsarnaev. FYI, there is no death penalty in Massachusetts, but since Tsarnaev is facing multiple federal charges, the death penalty is on the table.

Dzhokar's brother Tamerlan -- who was believed to have committed the atrocity with him -- was killed three days following the bombing in a shootout with police.

Dzhokar remains in custody.