shooting death last month of unarmed teenager trayvon martin. the reverend al sharpton expected to lead an event tonight in sanford calling for the arrest of nabe hood watch captain george zimmerman the man who shot and killed the 17-year-old. zimmerman told police he shot tray van martin in self-defense. steve harrigan is live in miami. what are the latest legal developments in this case. reporter: there is pressure for the arrest of zimmerman and pressure to fire the police chief of san tarred. that. the town where the it took place. it is is a bush of 60,000 people just north of orlando. last night at a meeting of county commissioners they voted 3-2 to ask the police chief to step down. because of the situation being so poorly handled and because of his no confidence level in our police chief here locally and statewide, nationally, and even