AP
Cameras were not allowed in the courtroom, but reporters on Twitter described how he looked.
He was wearing an orange jumpsuit, and his hair apparently looked long and disheveled. He also reportedly had a wound on the left side of his face. Reporters said he turned to smile at his family and blew a kiss to them once the hearing ended. His sister was reportedly in the courtroom for the arraignment.
Deborah Feyerick of CNN said Dzhokhar appeared nonchalant about the proceedings.
An indictment came down last month that detailed how Dzhokhar and his older brother Tamerlan carried out the terrorist attacks.
The attacks killed three and wounded more than 260 others in April.