BOSTON — Just before a jury began deliberating the fate of Boston Marathon bomber Dzhokhar Tsarnaev, prosecutors reminded jurors of the pain and suffering caused by the bombing and said Tsarnaev deserves to die for what he did.But Tsarnaev's lawyer said he was an "invisible" teenager in a dysfunctional family who was led astray by his older, radicalized brother and deserves a chance at redemption.