Not really. Yes, the police did a poor job of investigation but the prosecuting attorneys hands are tied. As I said before, while the death of this young man is tragic and sad, there is no criminal case that probably can be successfully pursued given the fact there are no witnesses, collaborating, compelling or circumstantial evidence. Had this happened in New York, yes. But in Florida, no. It's the nature of the state law.
Sad as it is, the exculpatory evidence for Zimmerman is his story of self defense. I personally don't buy it but in a court of law, it’s not what you think, believe or feel -it's what you can prove. The state of Florida generally allows its citizens to own, possess and carry guns with very few restrictions (except for convicted felons) and to use the weapons in self defense. Since Zimmerman said he used it in self defense and no one can refute this (other than the dead young man)…well….not much the state can do. Again, you can't prosecute someone because you feel it's the right thing to do -you have to prove the person violated the law and commited an illegal act. Perhaps maybe a civil suit…..?