Corey announced earlier this week that she would not convene a grand jury in the case. Experts familiar with Corey's background say she has a reputation for avoiding grand juries in cases in which they are unnecessary. Under Florida law, murder charges can only be issued by a grand jury. Zimmerman may face other charges in the shooting death, including manslaughter and assault.Read more at the following link.
George Zimmerman To Be Charged In Trayvon Martin Shooting: Report
I get the feeling their throwing the public a bone because he isn't being charged with murder, but they did arrest him.