A disturbing flurry of text messages has revealed that Boston Marathon bomber Tamerlan Tsarnaev was willing to lay down his life for his Muslim faith. It's the latest in a series of new revelations about the elder Tsarnaev brother, who was killed in a shootout with police in the early morning hours of Friday. Little is known about Tamerlan in the months before the attacks, but his brother has confessed that they were self-radicalized and angry over the wars in Iraq and Afghanistan. Fox News reported that in 2011, he sent text messages to his mother, Zubeidat Tsarnaeva, indicating that he was willing to die for Islam. Around the same time he sent those texts, suspicions were brewing about the 26-year-old former boxer. On Wednesday, U.S. officials described to the AP what the government knew about Tsarnaev since he was first placed on the intelligence community's radar 18 months ago. The officials spoke on condition of anonymity because they were not authorized to publicly discu