10:20 a.m.

A man who lost a leg in the 2013 Boston Marathon attacks has wheeled himself to the witness stand, staring intently at the bomber sitting at the defense table.

Marc Fucarile (FOO'-kuh-rihl) was the first person to testify Thursday for the prosecution in the penalty phase of the federal trial of Dzhokhar Tsarnaev (joh-HAHR' tsahr-NEYE'-ehv).

Fucarile says one of the first things he remembers after the second bomb went off is lying on the ground looking up at the sky and a nurse saying, "He's still on fire."

Fucarile's right left was blown off. He says his left leg was severely injured, and it's still unclear whether he will have to have it amputated.

Three people died and more than 260 others were injured in the bombings.