The Boston Marathon turned tragic on April 15, 2013 when two consecutive explosions went off near the finish line. It left spectators dead, 264 were injured and left the nation shocked. Review the timeline of events and timeline of the lives of the suspects.
The trial for Dzhokhar Tsarnaev, the man charged in the Boston Marathon bombings that killed three people and injured more than 200, begins Monday. Take a look back at scenes from the April 15, 2013, incident.