david mattingly has been following this case for us. he will all the way until the end. how significant is this development, this error? >> any time you ghet close to jury selection which starts next month, you have to be concerned with the credibility of the attorneys as well as the credibility of george zimmerman himself. so when you have the lead defense attorney coming out and saying i made this huge mistake, i'm apologizing for it, you have to wonder how it's going to be affecting potential jurors. also what's significant here, the public has never seen this. and it's possible we may never even see this in a court -- in the courtroom and the jury may not be able to see this at all. so at this moment, what it may say about the credibility of george zimmerman's defense team, that is what's most important as we go forward with jury dlection. >> and what is trayvon martin's family saying about this? i know that they've been fighting back against, you know, recent, you know, other things the defense is saying that have been very pejorative about trayvon martin. >> this h

thank you very much to david mattingly. >>> a shift in gears in the trial of former boston mob boss whiteyt's focussing on his status as an fbi informant. this was interesting because the court was shown excerpts from a 700-page informant trial on bulger as well as his official i.d. card as an informant which showed his code name. bs-15004oc, o.c. stands for organized crime. his attorneys call it forged, and i wanted to understand, why bulger and his team are so obsessed with whether he was an informant or not. he's on trial for 19 murders and a lot of other charges. they seem to be more focussed on proving he wasn't an informant than anything else. >> yeah. there's no question about. that and being an informant was the worst possible thing you could be in south boston. and bulger knew that he was going get away with it because no one would ever believe that he was ratting out his friends. the i.d. card that you showed, the 700 page file, which was about this tall and put right in front of the witness who was testifying about it shows a very different story. that bulger provided details on

our david mattingly is "outfront." >> reporter: if you are following the george zimmerman case you havee. [ gunshot ] >> reporter: the sound of of a shot from a handgun like the one caught on a 911 call the moment george zimmerman killed trayvon martin. >> all right, what is your -- what is your -- >> there's gunshots. >> you just heard gunshots? >> yes. >> reporter: zimmerman carried the gun legally. prosecutors seem to suggest he was doing more than that. >> it wasn't necessary for the defendant to rack it, to led of a round. it was ready to go. >> reporter: zimmerman was carrying the gun with the bullet already loaded in the chamber and ready to fire. was this a sign he was planning to do harm when hea encountered. trayvon martin. zimmerman was doing what he was suppose to do? >> was he carrying it properly? >> properly if i was ready to defend myself, you bet. >> reporter: holt said the gun is designed for personal protection. one of the cheaper guns selling for between $200 to $300. made to be concealed. carry, red to shoot. it is called carrying hot. you recommend to your students

david mattingly is "outfront" with the story. >> reporter: when george zimmerman was worried about ane 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 of -- he 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

david mattingly has more. >>> team three has 15th street -- >> reporter: the clock is ticking for thelet's mount up, folks. let's do it. >> reporter: the george zimmerman case exposed a deep bitter divide between the city's police and african-americans. on the job now only since april, chief cecil smith -- >> we're going to walk, knock on doors. >> reporter: hopes going door to door -- [ knocking ] >> reporter: talking to people in a city of a little over 50,000 will help get him out in front of a possible disaster. what is your worst fear? >> our worst fear is that we have people out of the community coming in and stirring up exactly what you talked about, violence in the community. >> reporter: it's a fear that goes all the way to the top of city hall. in a candid conversation, sanford mayor jeff triplett talks about how a zimmerman acquittal could bring an element of violence that the city has managed to avoid so far. >> that one person that came to town to throw a rock through a window or -- or start a fight or, you know, do something that would provoke someone else, provocation o

cnn's david mattingly has this story. >> reporter: salvaging from the atlantic option. this was the starting point for seeking answers. after four years of investigation, an electrical short circuit inside the plane was declared the culprit. but now 17 years later, a new documentary claims to have proof to support a not-so-new conspiracy theory about twa flight 800. >> what we do in the documentary is we show solid proof there was an external detonation. >> the primary conclusion is the explosive forces came from outside the airplane, not the center fuel tank. >> would that statement have been in your analysis? >> if i got the right one. >> reporter: according to its press release, the film, due to be released in july, is "a stunning expos detailing how the official investigation was derailed. >> the agenda was, if this is an accident, make it so. >> reporter: all put forth by a small minority of members from the original investigation team. the documentary has caused a stir. but men who helped lead the government investigation stand by their conclusions. the explosion

cnn's david mattingly has the story. >>> salvaging from the atlantic ocean, this was the starting point for seeking answers. after four years of investigation, an electrical short circuit inside the plane was declared the culprit. but now, 17 years later, a new documentary claims to have proof to support a not so new conspiracy theory about twa flight 800. >> what we do show in documentary is solid proof that there was an external detonation, but we also have corroborating information from the radar data. >> primary conclusion was that the explosive forces came from outside of the airplane, not the center fuel tank. >> would that statement have been in your analysis? >> if i got the write one. >> according to its press release the film due to be released in july is quote a stunning expose detailing how the official investigation was derailed. >> and the agenda was that this is an accident, make it so. >> all of this put forth by a small minority of members on the original investigation team. >> that is pretty high explosive. >> sometimes lawyers in the k country don't get a fair shake.

cnn's david mattingly has the story. >>> salvaging from the atlantic ocean, this was the starting pointrs of investigation, an electrical short circuit inside the plane was declared the culprit.

cnn's david mattingly has the story. >>> salvaging from the atlantic ocean, this was the starting point

first, david mattingly brings us up to the minute. >> police fire and medical. >> i heard a shot behind my house. >> shock, confusion, fear, you hear it in the voice of every 911 caller in the final moments of trayvon martin's young life. >> a person is dead laying on the ground. oh, my god. >> february 26, 2012. 17-year-old trayvon martin buys some skittles and ice tea, walks through a community of town homes where he is staying with his father. that's where he catches the attention of neighborhood watch volunteer, george zimmerman. >> these [bleep], they always get away. >> he was watching trayvon martin walking alone. >> this guy looks like he is up to no good or he's on drugs or something. >> less than a minute later, he gets out of his car. >> are you following him? >> yeah. >> okay, we don't need you to do that. >> okay. >> then a few minutes later, there's another call. >> 911, do you need police, fire, medical? >> maybe both, i'm not sure, there's someone screaming outside. >> in the background, listen for the sound of a fight and panicked voice yelling for help. >> is it a male

. >> and as part of the documentary david mattingly did a special investigative documentary on this lookingo try to conduct an investigation. and also david what some people were saying there were allegations of something shot from the ground, some sort of a rocket and conspiracy theories about what might have happened. what do you make of this new so-called evidence? >> let me put it this way. everything this filmmaker is saying flies in the face of what has become known as the most intense and most meticulous investigation in the history of aviation. this investigation did things that no other investigation ever did before or since. they actually recovered more than 90% of the plane from the bottom of the ocean. they didn't just bring it back to a hangar where they examined it. they gathered these pieces and they reassembled this aircraft, absolutely unheard of in any kind of air disaster investigation. but they did that. i walked through this aircraft that they reassembled. i saw the pieces that they put back together and i listened to the investigators as they described how painstakingl

here's his account with david mattingly. i'm sorry. apparently the clip is not in the system. i can tell you, david maclaine was a pilot on a flight from new england to trenton. the explosion happened right in front of his eyes. he saw two red things. but he didn't see anything else. nothing approaching the plane. just the explosion. >> if you've talked to this documentary, you know, filmmaker multiple times, just quickly, because you are so intrenched in this story, what's the likelihood the ntsb finally listens to this fwi and says, all right, we'll reopen. >> my guess on a scale of 1 to 100, zero. they've looked at this before. they haven't found anything. if he has any new evidence it certainly was not in that clip, the trailer from the movie that was made public to cnn today. >> pulitzer prize winning reporter jim polk. a pleasure, my friend. thank you so much. appreciate it. >> thank you as always. >>> coming up next, this. >> hln after dark, a rare nighttime tour. >> walking in the footsteps of george zimmerman, the man accused of killing trayvon martin. hln's vinnie po

david mattingly has looked at every one of those unspoken signals she could have sent to the jury. jeantel is not comfortable in the spotlight. she mumbles, grum bells, but manages to speak volumes whenever she reacts. she's so demonstrative. what is she saying to the jury? >> she's sending mixed messages. >> reporter: susan constantine is a jury expert and body language expert, starting with the frequent head rolls. >> so there's this disdain. you just don't get it. it's kind of like that nonverbal talking, you're just shrugging it off, you don't get what i'm talking about. >> reporter: but everyone knew what jeantel was saying when she gave this look. the look she gave the defense attorney, the jury saw this. >> exactly. the thing is, she's not aware and not only that but someone didn't do a really good job in doing the witness preparation because she needs to know that anything that she does, there are eyes around her like a fly. >> reporter: one message is loud and clear. watch this exchange at the end of testimony wednesday. no. >> what's that? >> i'm leaving today. >> reporte

cnn's david mattingly has this story. >> reporter: salvaging from the atlantic option.oint for seeking answers. after four years of investigation, an electrical short circuit inside the plane was declared the culprit.

cnn's david mattingly has this story. >> reporter: salvaging from the atlantic option.ng point for seeking answers. after four years of investigation, an electrical

david mattingly has an investigation. >> reporter: critics say it's a plan for destroying one of the most beautiful beaches in the gulf. but commissioner of conservation and natural resources says his state is perfectly justified in restoring this undeveloped beach by building a convention center on top of it. >> we believe we lost millions of visitors. we don't believe it, sure we did. we lost millions of visitors. you got to understand, there was oil in the water for 87 days. >> reporter: a one time wind fall for bp gives the five gulf states a billion dollars to restore damage natural resources and their loss of use from the massive 2010 oil spill. alabama wants to spend most of the money it's received so far replacing a lodge and conference center destroyed by a hurricane in 2004. you're not going to see another place like this in the area of the gulf. this much undeveloped beaches. >> i agree with you. we have almost three miles. we need to have a place where people can come and enjoy it. >> reporter: this isn't enough? >> we don't think it's enough. >> reporter: alabama plans t