article_snippet: Karen McWatters was the fifth witness of the first day of the terror trial of accused Boston Marathon bomber Dzhokhar Tsarnaev, who is accused of detonating pressure cooker bombs with Karen McWatters brother to punish the United States for policies the United States believe inflict suffering on Muslims.
article_snippet: Three people were killed in the blasts: Campbell, a 29-year-old manager for a restaurant chain; Martin Richard, an 8-year-old boy; and Lingzi Lu, a 23-year-old grad student.
article_snippet: And the first day of the trial -- after opening statements -- revolved around a number of survivors of the attack, who recounted in detail the chaos of that day.
article_snippet: Krystle Campbell's death was the first to be described in detail at Tsarnaev's trial.
article_snippet: But descriptions of the other two deaths at the marathon and the death of a police officer at the Massachusetts Institute of Technology will come soon.
article_snippet: Boston Marathon bombing timeline .
article_snippet: Anyone who follows the news has seen footage of the bombings and read accounts of what happened.
highlights_snippet: The first day of the Boston Marathon bombings trial focuses on the survivors .
  
highlights_snippet: Several survivors testify about the sights, smells and pain of The first day of the Boston Marathon bombings trial .