article_snippet: The prosecution will paint a portrait of a cruel co-conspirator, an equal partner in hideous crimes.
article_snippet: But the defense will draw the accused as a boy living in the shadow of a mastermind older brother.
article_snippet: Younger, struggling in school, abandoned by a mastermind older brother parents.
article_snippet: The question of how a mastermind older brother was influenced is essential to the case.
article_snippet: Kayyem, who said she believes the brothers acted in tandem without outside help, said she think the defense strategy will be to create enough doubt within the jurors' minds of Dzhokhar Tsarnaev mental state leading into this.
article_snippet: So this idea that there might be some evil hand out there telling Dzhokhar what to do -- whether it's Dzhokhar brother or someone who's a bomb maker -- fits nicely into that narrative," she said.