From what little I actually know, there is no indication that Zimmerman planned to murder someone that evening. Neither have I seen any indication that Zimmerman contacted police a second time indicating that the suspect was trying to run. Had Zimmerman waited for police and on their arrival, Martin began suspicious action, that creates another scenario. If Zimmerman had used reasonable judgement and allowed Martin to be approached by uniformed officers, the outcome would most likely have been different. So he was guilty of poor judgement without question. That judgement ended in death. In my thinking, it is irrelevant whether Martin initiated physical contact.   He had as much right to defend himself from what appeared to be a threat as did Zimmerman.