At one point, the teenager forced Zimmerman to the ground -- his head hitting the pavement -- and he cried out for help.

CNN: STORY HIGHLIGHTS

She told me that she had cried for days when her oldest son, Tamerlan, told her that he wanted to move out, going against her culture's tradition of the son staying in the house with the mother until marriage.

NPR: For Bombing Suspects, Question May Be Who Led Whom