By all accounts, the paths traveled by the Tsarnaev brothers in their new American lives had begun to diverge. Tamerlan, 26, the elder brother, turned more deeply to his Muslim faith as once-promising boxing prospects faded. Dzhokhar, seven years his junior, won a college scholarship, gained U.S. citizenship and was seen by friends as embracing the opportunities of his new country.

Still, their lives were far more tightly bound than outsiders might have perceived. They shared a dark, secret connection until the moment that the FBI posted their images as the terrorists suspected of making and detonating twin pressure-cooker bombs near the finish line of the Boston Marathon on April 15.

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