said that he possibly changed his perspective in life and that he was responsible and not just for himself anymore, but for his wife. reporter: osterman, a federal law enforcement officer, helped zimmerman weigh the pros and cons before he settled on a thin, lightweight lightweight, .9-millimeter. it was easy to conceal, easy to carry. and acting on osterman s advice, zimmerman carried it everywhere. always. he carried it always, and the one thing i did tell him for the reason for doing that was, if it is on your person, it can t be anywhere else. reporter: it was on zimmerman s person the night he encountered trayvon martin, and he told osterman how martin grabbed the gun during their fight. according to what he told me was, when the head-bashing on the concrete stopped and trayvon reached for the firearm that was at his side, grabbed a hold of it, that snapped him out of that and he snapped out of that
aimed it at him and fired one shot. reporter: dna testing seems to agree. there was no trace of trayvon martin s dna on the gun s grip. prosecutors list osterman s book with zimmerman s conflicting account as potential evidence, possibly to challenge zimmerman s credibility. as for his connection to the gun zimmerman was carrying, osterman says it s hard to answer the question does he feel regret. so, i would wish it would have never happened. however, the reason why george had it, it was not for malice. he didn t have it to go out and commit a crime of hunting someone down and harming them. it was for self protection. and i m glad that that firearm was used to protect george. and now david, so, if he really is george zimmerman s best friend, how does mark feel
the jury will have to decide that, and i think once they think about those two things, it will be rather clear what s relevant and what s not. benjamin crump, always good to talk to you and thank you very much for taking the time. one of george zimmerman s best friends could complicate his defense. mark osterman came to zimmerman s aid the night he shot and killed trayvon martin, and the account that he says zimmerman told him about what happened that night doesn t add up to some of zimmerman s later statements. david mattingly is outfront with the story. reporter: when george zimmerman was worried about an aggressive neighborhood dog in 2009, he decided to buy a gun and went to his friend, mark osterman, for help. did he tell you why he wanted this gun? um, no. he didn t tell me why. reporter: did it seem like he was afraid no, it reporter: that something may have happened? no. the thing was, he had felt that once he gets married, once you get married, you kind
comments quoted by his friend do not match what zimmerman told police. listen to what he says as he walks investigators through the crime scene. he reached for it. i grabbed it and grabbed my firearm and shot it one time. reporter: in multiple recordrd interviews he never said he ever touched his gun. dna testing seems to agree. there was no trace of his dna on the gun s grip. prosecutors list the book with zimmerman s conflicting account as potential evidence possibly to challenge zimmerman s credibility. as for his connection to the gun zimm zimmerman was carrying he said hst hard to answer the question. does he feel regret? he didn t have it to go out and commit a crime of hunting someone down and harming them. it was for self-protection.
never tells police that trayvon martin ever touched his gun. i felt him take one hand off my mouth and slide it down my chest and i just pinched his arm and i grabbed my gun and aimed it at him and fired one shot. reporter: dna testing seems to agree. there was no trace of trayvon martin s dna on the gun s grip. prosecutors list osterman s book with zimmerman s conflicting account as potential evidence, possibly to challenge zimmerman s credibility. as for his connection to the gun zimmerman was carrying, osterman says it s hard to answer the question does he feel regret. so i would wish it would have never happened. however, the reason why george had it, it was not for malice. he didn t have it to go out and commit a crime of hunting someone down and harming them. it was for self protection. and i m glad that that firearm