Yes, Harvey Dent did die. They had his funeral and everything, but others are saying that Harvey died, and they had Harvey's funeral but Two-Face survived, meaning that all of the good in Harvey is dead. But i doubt it, i'm sure all of him is dead.
He doesn't. I doubt he meant to actually kill him, but Harvey had a gun to Gordan's kids head. He had to save Gordan's son.
Bruce found a bullet that was shot at one of the cops, but it went through the wall. He took out that block, and did some type of search, to where they can put the bullet fragments together, and there was a finger print on it. The finger print was on it, from when they put the finger in the cage. I doubt that techonology actually exsits.