mark osterman came to his aid the night that he shot and killed trayvon martin.ount 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? >> no. he didn't tell me why. >> did it seem like he was afraid? >> no. >> that something may have happened? >> no. the thing was, was he had felt that once he gets married -- once you get married he said that he possibly changed his perspective in life and that he was responsible 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 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. i -

and acting on osterman's advice, zimmerman carried it everywhere. >> always.ied 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 tunnel vision. he was able to smack the hand away from the firearm, and that's when he drew the firearm and fired. >> reporter: osterman wrote about it in a book, quoting zimmerman -- "somehow, i broke his grip on the gun where the guy grabbed it between the rear site and the hammer. i got the gun in my hand, raised it toward the guy's chest and pulled the trigger." and this is where the problem lies for george zimmerman, because comments quoted by his friend, osterman, do not match what zi

the ostermans were supposed to go with us to st. croix. oh, that's too bad.the reservations? the package we got was for 4. oh, right. hey, listen, would you guys have any interest in coming with us? us? yeah. sure! are you sure you're not asking us 'cause we just happen to be standing here and it's awkward? no, we would love to have you.

joining me for tonight's big picture a politics panel or osterman. reporter and weekend editor at red alert politics k. steiger managing editor of the ross story and no one kid conservative commentator and editor of the guns and patriots newsletter. it's it's. very exciting yes indeed thank you very much thanks for all i'm just curious i find myself you all heard my opening rant and i am just totally solidly of the opinion that. there are things the government should do making shoes and computers isn't one of them but spying on other people is all in favor of having spies all in favor of our you know all of that but. private for profit corporations doing our spying for us and doing it with the c.e.o.'s making three million bucks a year on the spies making two hundred thousand bucks a year with a ged i have a problem with that i find myself in the in the company of bernie sanders and glenn beck in saying that edward snowden was a hero and that since there's something fundamentally wrong about this i'm just i just like to take a quick poll here and get