tonight on "nightline," the trayvon tapes. just released in florida, potentially explosive new evidence tonight in the racially charged trayvon martin case. never before seen pictures, phone logs and eyewitness accounts. and video of trayvon martin just minutes before he died. and, finders keepers. a high-stakes auction for lost luggage, laptops, even lingerie? we show you who is cashing in on your lost things. plus, a diva's last dance. america bids a sad farewell to donna summer, the undisputed queen of disco. >> announcer: from the global resources of abc news, with

terry moran, cynthia mcfadden and bill weir in new york city, this is "nightline," may 17th, 2012. good evening, i'm cynthia mcfadden. tonight, groundbreaking evidence into the investigation of what really happened the night trayvon martin was shot by neighborhood watchman george zimmerman. it's the case that sparked widespread outrage across the country, igniting racial tension and massive protests. abc's matt gutman has been closely following this story and now he brings us the latest from sanford, florida. >> reporter: tonight, the very first video ever seen of trayvon martin. february 26th, the night he was fatally shot in florida. here, he's in the 7-eleven, wearing the hoodie that would become the symbol of his death, triggering marches and protests. and memorials.

a death that tonight is becoming increasingly complex. just hours ago, a document dump by the prosecution, seeking a second-degree murder charge against george zimmerman. hundreds of pages of documents, pictures, audio and video. in them, a different portrait of the 28-year-old neighborhood watchman that shot martin that night. the shooting set off a national fire storm. it appeared zimmerman attacked martin, taking the law into his own hands and killing an innocent black teenager, motivated by racial malice. meanwhile, zimmerman, half hispanic, claimed he was in a life and death struggle with martin that night and that the single shot was in self-defense. we now know zimmerman was arrested at gun point and here, clear pictures of zimmerman taken at the police station just moments after the shooting. the back of his head cut and bleeding, in a squad car here, his nose already swelling, bloody. a doctor's report first obtained by abc news diagnosed zimmerman with a closed fracture broken nose.

one witness says he saw martin astride zimmerman, pummeling him, mixed martial arts style and a paramedic reported injuries. >> he had abrasion on his forehead. a deformity on the nose, kind of a little bit swollen. he had some abrasions on his cheeks and face. >> reporter: and the documents show zimmerman did not require stitches. did not suffer a concussion and declined to go to the hospital on multiple occasions, saying he thought he'd be okay. but tonight, a key question remains. no one witnessed zimmerman shoot or what sparked that fight. >> the witness accounts, the police accounts from these documents pretty clearly demonstrate that there was an altercation. that george zimmerman was injured. >> reporter: the night of the shooting, zimmerman called the police. >> this guy looks like he's up to no good or he's on drugs or something. >> reporter: but then he follows him and leaves his vehicle.

>> are you following him? >> yeah. >> okay, we don't need you to do that. >> reporter: you can hear the breaths he takes following him. 90 seconds later, these 911 calls. >> there's someone screaming outside. >> a guy yelling help, oh, my god. >> hurry up, they're right outside my house. >> reporter: the residents reporting these chilling howls. raising another key issue. who was calling for help that night? police determine these howls to be those of zimmerman, who apparently shouted up to 14 times in a 38-second span, according to an investigator. another point of particular contention, the investigator says, i asked mr. martin if the voice calling for help was that of his son. mr. martin quietly responded no. but the martin's family lawyer says that's not the case. >> when he listened that tape, undistorted in the city manager's office, he broke down and cried like a baby, hearing his son beg for help before he was shot and killed.

>> reporter: the police department was criticized after the shooting, not testing zimmerman for drugs or alcohol. apparently not knowing that he was on adderall, failing to ask questions if they knew martin, who was living just down the block and sending narcotics investigators to a homicide. so, which side does this information benefit? >> there's a lot here that seems to help the defense team. but let's remember. trayvon martin was still shot and killed by george zimmerman. and so even if zimmerman was on his back, even if he was losing a fight, he still has a lot of explaining to do and it's going to have to prove that trayvon martin was the initial aggressor. >> reporter: and for martin, we learned tonight he was slightly better built than previously thought and had thc, or marijuana, in his system, the night he was shot. experts tell us likely from using the drug a few days prior. we also learned that the bullet

that killed martin was a single shot fired from less than 18 inches away. >> so, this was not a contact shot. this was not a shot from a large distance. this would argue that it was a firing during a struggle. and it's very consistent with mr. zimmerman's story. i suspect this is going to be difficult for the prosecution to show that this was a deliberate firing, because it was not at long range. >> reporter: today's documents show that the lead investigator called the shooting, quote, avoidable, had zimmerman remained in his vehicle and awaited the arrival of law enforcement. and finally, the shooting that shattered two families and ripped open a gaping wound in the racial fabric of the country, according to a witness, may have just been seconds from being prevented. >> i saw the police arrive and they were literally, like, five seconds too late. >> reporter: for "nightline," i'm matt gutman in sanford, florida. >> our thanks to matt gutman for his continued reporting on the case. "gma" will have much more in the morning.

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>> announcer: "nightline" continues from new york city with cynthia mcfadden. >> it's a new chapter in the booming industry of making big money from your suitcases and carry-ons. airlines raked in $3 billion in baggage fees last year. and they're not the only ones cashing in. abc's linsey davis takes us inside the world of the fortune hunters hoping to hit the jackpot by bidding on lost luggage.

>> reporter: m-i-a. not only the acronym for miami international airport, but missing in action. and this is where the two become one and the same. what you see here is the place where bikes, laptops, cameras, all kinds of luggage left in the lurch comes to die. a graveyard of garment bags, disregarded duffles and cast aside carry-ons. only, the headstones in this cemetery are all unmarked. none of these bags have i.d. would i find a name tag? >> we take the time to make sure we reconnect the item with the person, if that's possible. we're not a storage bin, so, after 60 days, it's like, okay, time to have an auction. >> reporter: last year, there were nearly 2 million reports of sidelined suitcases, either lost, damaged or delayed. about 10,000 bags a year go missing right here in miami. and when the carousel stops spinning, this is the black hole

where they end up. and it amounts to a nice payday for the air porments. at this particular airport, they made about $100,000 in lost luggage auctions last year alone. >> people leave it, they forget about it, they don't need it, they have a lot of stuff, they need to get it out. somebody else's loss is somebody else's gain. this is the mecca of lost luggage. >> reporter: meet one of those somebodies. bill ly leroy. billy is one of the stars of the travel channel's new show "baggage battles." it follows three teams of savvy auction special ilss who travel the globe, placing bets in the high stakes world of luggage auction. we're talking dozens of auctions, thousands of bags and millions of dollars at stake. but this is no ordinary auction. in this case, so to speak, their

builds are based on sight unseen instincts. >> the key thing is, you cannot open these bags. you have to shoot from the hip and just buy it. it sounds crazy, but that's how i do it. that's how i make my business, by my gut feeling. >> reporter: do you get excited just walking in and seeing all the potential? >> of course. this is like christmas. >> reporter: but he won't know if it's junk or a jackpot until he wins the band opens the suitcase. so, what's the art here? how do you detect the hidden treasures? >> well, i have my famous test. that's the smell test. if it smells bad, i don't bid on it. this is a horror show, okay? >> reporter: the day before the auction, you get 60 minutes to preview hundreds of bags. you are thinking that the carry-on is likely going to have more valuables because this is something the person intended to keep -- >> you've already got the formula. it's not very heavy. >> reporter: $5,000 in his pocket and a cartier catch

that's caught his eye. it says cartier. he strategizes. >> anything heavy, i bit and cheap. >> reporter: come auction day there's little time to second guess. >> $5! >> reporter: this organized chaos happens twice a year in miami. bidders, most of them just regular people hoping to hit the jackpot, pay a $3 admission to play in this standing room only game of finders keepers. >> sold, 100! >> reporter: it's not only lost baggage but a whole lot of bling bling -- >> another bag of jewelry. >> reporter: that turns into cha-ching. >> sold, right here, $1,000! billy, meanwhile -- >> sold! >> reporter: is looking to turn a profit. just as he's done so many times before. like these rare coins he was able to cash in on after finding them in someone's pants pocket. >> this is worth at least 1,000 pounds. >> what? >> yeah. >> reporter: and this trunk full

of military items. he spent $350 and took home almost ten times as much. >> it's an airman's map. >> reporter: back in miami, he's spent two grand, knowing full well all his call cue laxs and punches could amount to this particular purchase he made. one big bust. >> it's not good. you see? that, i could not see through -- >> reporter: the bag. >> the bag. >> reporter: there's always the swiss army bag, which he spent $200 on. >> momma. all this is going right to the dumpster. it's got all his information, in this bag. i night do a good deed and return this bag to the owner. >> reporter: perhaps that will get him good kara for his future duffle dives, because this time, he's couple up empty handed. >> look at that. no name. you should have marked your bag. >> reporter: for "nightline," i'm linsey davis in miami. >> oh, boy.

"baggage battles" airs wednesdays on the travel channel. thanks to linsey. and just ahead, the surprising story behind "she works hard for the money," as we say a sad farewell to donna summer. i haand then i have eleven my grandkids. right when you see them, they're yours, it's like, ah, it's part of me. it's me again. now that i'm retiring they all have plans for me. i'm excited. ♪ ♪ ♪

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pop music lost one of its great stars today when the original disco queen, donna summer, passed away at 63, after a battle with lung cancer. a singer so talented, she transcended the trend that made

her famous with a star power that lasted 40 years and built a legend. ♪ last dance ♪ last dance tonight >> reporter: it seemed entirely right that the woman who had become the queen of disco was born on the biggest party night of the year. new year's eve. entering the world outside boston as la donna adrian gains. she died today, too soon, at 63. ♪ love to love you baby ♪ love to love you baby >> reporter: she became famous as donna summer. first, in 1975, with "love to love you baby." ♪ love to love you baby >> reporter: she would go on to win five grammys and sell more than 130 million records worldwide. you could not have been alive in america in the 1970s without encounters encountersing her music.

♪ i need you beside me ♪ to guide me >> reporter: "last dance" was only one of her biggest hits. four years ago, she sat down with "nightline" to talk about her music. >> a lot of clubs had disco balls and being queen of the disco made that with me so people would come to the spokes with disco ball earrings and necklaces. and people had them above their own bepds when they were, you know -- i did not. though, i'm thinking about maybe returning to disco ball at this age. >> reporter: her upbeat per e sew that was reflected in her music and her musical taste. she told us gloria gaynor's "i will survive" was one of her favorites. ♪ i will survive >> gloria gaynor, a lot of people think i sang that song and i wish i could tell them. i used that song in my own life and it's helped me through moments in my life where i

think, i have to get through this. >> reporter: one of seven children, summer was raised in a devout family. >> i started singing solo in church, i was only 8. i opened my mouth and this voice just shot out of me. i shocked me and i started crying and everybody in the room started crying and i heard the voice of god say to me, "you're going to be famous." this is power and you are never to misuse that power." >> reporter: that insight in 1983, when she was inspired to write "she works hard for the money." ♪ she works hard for the money ♪ so you better treat her right ♪ >> i was at the grammy us, a party, and i went to the ladies room and on my way in, i saw the attendant. and my first thought was, god, she works hard for the money. i ran in the room, i got my manager and we went back in the bathroom, grabbed some toilet paper and we wrote it on the paper. ♪ you better treatment her

rigrigh right ♪ >> reporter: she died early this morning at home of lung cancer. surrounded by her family. she leaves behind three children and four grandchildren. surely, if there is a choir in heaven, no audition will be required. ♪ last dance tonight >> reporter: donna summer. thank you for watching abc news. "jimmy kimmel live" is next. and tonight, we'll let donna summer sing you good night with more of her "last dance." ♪ i need you by me ♪ beside me ♪ to guide me ♪ to hold me ♪