listen to the 2911 calls. first you are going to hear police tell zimmerman not to follow the teen. here's when the 911 operator and then you are going to hear someone in the neighborhood who called 911. and heard an appear engunshot. >> are you following him? >> yeah. >> we don't need to you do that. >> so you think he is yelling help n. >> yes. >> all right. what's your -- gunshots. >> chilling when you hear the gunshot. joining me live from miami is "miami herald" reporter frances. thanks for being here. so many questions. i have to tell you, facebook, twitter, they are blowing up about this issue. so this is a hot button one. let's try on get all of the details as we have thus far. george zimmerman, what have you learned about him? >> george zimmerman is a guy who took his role as neighborhood captain really, really seriously. and he was trying to foster a sense of community and so in --