http://www.thefreedictionary.com/criminal
Being a criminal is not dependent on a conviction. It's merely one who commits crimes. Trayvon committed a crime and therefore he is a criminal, whether or not he was convicted is irrelevant.
n.One that has committed or been legally convicted of a crime.
Two big parts. First is in mid april where there is a mini-trial of sorts to determine if stand your ground applies. If it does, zimmerman walks. If it doesn't, he can still argue self defense and the main trial will be in june.
Asked and answered
Yes we can have it both ways. There are more than enough reasons in our justice system to kill somebody in self defense. Zimmerman legally executed the criminal trayvon martin after he was savagely beaten and brutalized and in fear for his life. He was on his back getting his head pummeled into the ground. Trayvon martin on the other hand savagely beat zimmerman, completely unprovoked. Zimmerman had committed no crime before Trayvon mercilessly attacked zimmerman.