article_snippet: Closing arguments are scheduled for Monday.
article_snippet: Clarke asked jurors in her opening statement to keep jurors minds open to an alternative explanation.
article_snippet: The defense began The defense case with two witnesses called to offer scenarios that differ from the version of events offered by FBI witnesses.
article_snippet: One focused on the the defendant's Twitter posts a year before the marathon, including mundane matters such as whether he should sleep in or get breakfast.
article_snippet: CNN's Aaron Cooper contributed to this story.
highlights_snippet: Prosecution presented more than 90 witnesses over the course of a month .