9:20 a.m.

Boston Marathon bomber Dzhokhar Tsarnaev (joh-HAHR' tsahr-NEYE'-ehv) is back in federal court for closing arguments from prosecutors arguing he should be executed and defense attorneys hoping for mercy and life imprisonment.

Tsarnaev is sitting between his lawyers at the defense table and appears to be looking through some papers, while resting his face on his hand.

Prosecutors have portrayed Tsarnaev as a callous, unrepentant terrorist who carried out the deadly 2013 attack with his radicalized older brother, Tamerlan. They say he deserves the death penalty.

Tsarnaev's lawyers admitted he participated in the bombings but told the jury he was heavily influenced by Tamerlan.

Three people were killed and more than 260 injured when twin bombs exploded near the finish line. The jury could begin deliberating later Wednesday.