Only fools are questioning if there is enough evidence to keep this guy in jail for the rest of his life. Color me skeptical of him ever being granted parole without an absolute guaranteed public uprising. If you're convicted for knowingly taking part in a plot to blow up innocent civilians you've given up your right to ever being granted parole.
If you were to wager a guess, what type of individuals do you think will constitute the twelve-person jury? Bright individuals with families, jobs, and better **** to do than be sequestered for a few weeks?
Publicly available evidence:
1. He was walking around with a backpack in the vicinity of where the explosion took place on the 15th.
2. There is a one eyewitness that states he put the backpack down and the backpack exploded.
3. He is in a photograph fleeing the scene of the explosion, it is not certain whether or not he still has his backpack.
4. He was in a car with his brother that was being chased by police. There is testimony from a man who speaks rudimentary English that these two told him they were the marathon bombers and they killed Collier.
5. There was a shootout with police. Pictures show only one individual firing a weapon (maybe both were, but it is not in the pictures). A firearm was found at the scene after Tamerlan was gunned down and then run over by his brother.
6. Explosives detonated during the pursuit. These explosions, however, did not even come close to the magnitude of the two explosions on the 15th. Reports go back and forth as to whether these explosives were pipe-bombs or pressure-cooker IEDs of the type used on the 15th. Whose explosives were they is a solid question.
7. IEDs and pipebombs were found in Tamerlan's apartment. Dzhokhar had a dorm at UMass, Dartmouth.
8. Dzhokhar was found in a boat, police opened fire with over twenty rounds because they could have sworn that he pointed a weapon at them. He was found with no weapon.
9. Dzhokhar confessed to the marathon bombing and the killing of Collier prior to being Mirandized.
That is all the publicly available evidence that I know of. (9) might be inadmissible. And, because of (8), any testimony from officers in the pursuit is going to come under extreme scrutiny. After all, they were so certain that he came out and pointed a weapon in their direction, that they unleashed twenty rounds at him; yet, he was unarmed, so the cops got it wrong. That is huge, and the only way the cops get around that scrutiny is for one of them to admit that he (or a group of them) were actually just trying to kill an unarmed person who presented no immediate threat.
A life sentence with no possibility of parole is going to hinge on either more eyewitness testimony that corroborates the story of the backpack being placed by Dzhokhar and exploding, or video evidence of said event.