Perhaps the only man in the world who can explain why the Boston Marathon bombings took place is sedated with a tube down his throat, unable to speak.

Suspect Dzhokar Tsarnaev was in serious but stable condition at a Boston hospital and cannot talk, Massachusetts Gov. Deval Patrick told reporters.

"I, and I think all of the law enforcement professionals, are hoping for a host of reasons that the suspect survives, because we have a million questions, and those questions need to be answered," the governor said Saturday.

As Tsarnaev remains under heavy guard at the hospital, a flurry of new details have emerged in the case.