It was an emotional day in court, as jurors viewed the autopsy photos of Boston Marathon bombing victim Krystle Campbell.
One juror grabbed a tissue as she wiped away tears, while another juror overcome with emotion put his head in his hands.
Medical examiner Dr. Jennifer Hammers testified that Campbell died from blast injuries to her torso and legs, saying that she lost so much blood that she likely survived less than a minute before succumbing to her injuries on Boylston Street.
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The autopsy photos were only shown to the jury, witness and attorneys on either side, but defendant Dzhokhar Tsarnaev turned around in his chair and glanced quickly at the display screen before being told to turn back around.
Earlier in the day, jurors heard testimony from FBI agent Edward Knapp, who pieced the thousands of bomb components found on Boylston Street and in Watertown back together and created mock ups of the devices.
He let the jurors handle and examine each replica bomb and explained to them how the components were modified - from remote controlled car transmitters, receivers and batteries to send energy to a modified Christmas tree light, and how fireworks powder was placed into pressure cookers and pipe bombs, fashioned with hobby fuse as a back up detonator.
Agent Knapp then showed the jury how the electrical components worked, by arming the inert replica devices and pressing the trigger on the transmitter which lit the Christmas tree light that glowed brightly green.
He explained in the actual device the filament on that light would have set off the bomb.