only saw slices of what happened, he said. We are confident that at the end of this trial you will know in your head, in your heart, in your stomach that George Zimmerman did not shoot Trayvon Martin because he had to, Guy said. He shot him for the worst of all reasons, because he wanted to. Fast facts: Trayvon Martin shooting In the first day of testimony, jurors heard witnesses recount Martin's trip to the convenience store, Zimmerman's call complaining about a suspicious person walking through his neighborhood before Martin's killing, and a call from the previous August, in which Zimmerman reported an alleged burglary to police. Proceedings ended for the day when defense attorney Mark O'Mara objected to the earlier call, which prosecutors argued was necessary to explain Zimmerman's remark about burglars who get away. The Martin family sat watching the proceedings behind State Attorney Angela Corey. Before witness testimony began, Judge Debra Nelson denied a defense request that Martin's father, Tracy Martin, leave the courtroom. Tracy Martin is a potential witness, and potential witnesses can be forced to sit outside of the courtroom to keep their testimony from being tainted by other witnesses. But the next-of-kin of victims are allowed to remain in court even if they 're expected to testify. O'Mara also accused Tracy Martin of using an obscenity toward a friend of