on our broadcast here tonight, breaking news in the travon martyr murder investigation. the late release tonight of evidence in the case. hidden risk. the antibiotic people so often ask for by name. tonight, a big warning about potentially fatal consequences for some people who use it. >> payday, facebook goes public. it's about to make a lot of people wealthy, but what about buying stock? >> the queen of disco is gone. the unmistakable voice of donna summer. "nightly news" begins now.

good evening. just now tonight, we're getting our first look at the acchm police evidence in the case of the shooting death of trayvon martin. tonight, documents are being released showing what police and the medical examiner found out, including interviews from witnesses, from the night george zimmerman fired his weapon, resulted in the death of an unarmed teenager. for starter tz, she was shot through the heart at close range after the scuffle with zimmerman. it's part of what we learned in the release of evidence tonight. kerry sanders starts us off from sanford, evening. >> good evening, brian. the evidence includes never before seen photographs of the crime scene, where the neighborhood watch supervisor actually shot and killed trayvon martin. that was on february 26th. george zimmerman has claimed self defense. and there are these photographs of the weapon that zimmerman had with him that night.

it's a cal tech 9 millimeter. and there's this grainy photograph of george zimmerman. it was photo copied, but it appears to show him with a bloody nose. included in the documents are investigators' reports. one with trayvon martin's father on february 28th. quote, i asked mr. martin if the voice calling for help that night was that of his son. mr. martin, clearly emotionally impacted by the recording, quietly responds, no. the victim's mother has insisted that the screams were indeed her son's they were recorded on a phone conversation to 911. >> in another document, a witness told police the screams were coming from george zimmerman and trayvon martin was throwing punches mma style. that's mixed martial arts style. included in the toxicology report is that trayvon martin had thc in his blood stream. that would indicate that he had been using marijuana, but

perhaps no surprise, because days earlier, he had been suspended from school because a baggy with trace amount of marijuana was found in his book bag. >> kerry sanders starting us off from sanford, florida, with this late release of evidence. today in north carolina, a tale of two very different john edwards. was he a bad husband or something worse, a criminal? he was presented to the jury in the campaign finance trial. >> arriving with his daughter cate and his parents, john edwards looked mow tense than usual for what his lawyer called the most important day of his life. prosecutor robert higdon laid out the government's case, using edwards' own campaign rhetoric against him. >> there's still two different americans. one for all of the families who get everything they need whenever they want it and one for everyone else.

>> higdon said in using almost $1 million from wealthy donors, he violated campaign laws designed to bring the two americas together at election time. his voice indignant, he detailed the scream to protect his political ambitions by hiden hunter. quote, until the election was over and his wife passed away. >> his most important point was that john edwards had to have known this cover up was a crime. he was too smart not to, and the convoluted money trail proved it. >> abbe lowell asked jurors to distinguish between a sin and a felony. he said he's already serving a life sentence for what he did to his family. he tried to pick apart the government's case, saying it's based largely on the star witness, andrew young. john's conduct is shameful, but it's human, andrew young's lies on the stand and the government sponsoring those lies is worse,

lowell said. he said he was wealthy enough to use his own money to pay his expen expenses. at time, emotional, he said for his all wrongs, edwards still can do good. please let this sad chapter end and stop with your verdict of not guilty. the jury begins deliberations tomorrow and will decide whether edwards gets to go on with his life or becomes a convicted felon. if found guilty, he could face up to 30 years in prison. >> lisa myers, greensboro, north carolina, tonight. in presidential politics, for was an explosive headline tonight. the "new york times" reporting that a republican super pac was considering an expensive anti-obama ad campaign that would have put the issue of race front and center in the campaign and lainked the president to soe of the more controversial statements by his former pastor, jeremiah wright.

as nbc's peter alexander reports, it's the latest evidence of the power of money. >> he tried to distance himself for a $10 million ad campaign designed to renew attention on president obama's ties to his controversial former pastor, reverend jeremiah wright. >> i want to make it very clear i repudiate that effort. i think it's the wrong course for a pac or a campaign. i hope that our campaigns can respectively be about the future. >> a leaked copy of the 54-page proposal entitled the defeat of barack hussein obama was presented this week to the super pac funted by joe ricketts whose family owns the chicago cubs. the referral referred to him as the met rosexual black abraham

lincoln. and they planned to release wright's statements, including this one. >> america's chickens coming home to roost. >> in a statement to nbc news today, the super pac insists the ads won't air, adding the proposed campaign reflects an approach to politics that mr. ricketts rejects, and it was never a plan to be accepted. still, on a day the romney campaign wanted the focus to be on its raising more than $40 million last month, a reignited debalt over how super pacs can both help and hurt a campaign. >> voters do not distinguish between ads coming from the campaign versus the super pacs, so candidates run the risk of being held accountable for bad things this super pacs do. >> romney today tried to cast himself as the one taking the moral high ground, characterizing his new ad out tomorrow as positive and criticizing the obama campaign for what he called character assassination. peter alexander, nbc news,

washington. from silicon valley to the wall street banks to the individual investor, the big story tonight is facebook going public. the social networking giants priced its initial public stock offering tonight at $38 a share, which is the upper end of what a lot of the analysts were estimating. that will give the company a valuation of $104 billion. making it the biggest ever valuation of a company in its public debut. facebook has 900 million users around the world. and at least some of them will want to own the stock, which begins trading on the nasdaq tomorrow. with us tonight from facebook corporate headquarters in california, cnbc's technology correspondent john fort, and john, how does this work? who gets first crack, and what about the folks everywhere who night want a share or two of facebook stock? >> as you suggested, if you're online, chances are facebook owns a piece of you, your

pictures, your friend list. here's a chance to own a piece of facebook. once it goes ipo tomorrow around 11:00 eastern, anyone can buy it. the question is whether it's a good investment. this isn't some spring chicken company that nobody knows about. it's going public, as you said, as a very, very expensive company. the people who are really going to make out are the early investors who are selling their shares to the rest of us, the public, tomorrow. mark zuckerberg is trying to make sure things don't change too much when the company goes public. that's why he wore his hoodie to wall street, why he's going to be with the engineers, counting code, not their profits. >> john, thanks. overseas now to the uncertainty surrounding greece and the fears that the economic meltdown there could cause major case osin markets everywhere, including, of course, this country. for many ordinary hard working

greek citizens, this nightmare has already happened. a rare broithd spot in athens. the olympic torch handed off to the organizers of london 2012. but on the other side of town, evidence of the now daily struggle just to get by. many of these women lining up for free milk, frozen chicken, and detergent, aren't used to being poor. >> you're scared. me and my country are scared. >> to avoid bankruptcy and remain part of the eurozone. grease agreed to be part of the budgets cuts. protesters hit the streets over pensions, jobs, and minimum wage. they gave a drubbing to the parties that agreed to the bailout plan. the election left the government split. now they have to vote again. the new elections are scheduled

for june 17th, but until a government is formed in this country, there is uncertainty, and uncertainty breeds fear. this week, they felt it at the banks. on monday alone, greeks withdrew $700 million euros from their banks. jennifer took out her entire savings in cash because she worries greece will return to its own currency. >> the time was right to make that move. >> the return and the impact it would have on europe is a concern for the whole world, including the u.s. >> americans should care because this is the biggest economy of the world, their biggest export market. >> at the donation center, this woman is fed up with the politicians. >> they all shout, we love our country. okay, do something about it. we don't see that. >> what she sees is the need for help growing day by day.

stephanie gosk, nbc news, athens. back in this country, there have been a lot of warnings that this wildfire season is going to be very bad, perhaps even historic because of the lack of winter precip and snow back. so far it's bad in arizona where the big fires grew even larger. as you may know, western fires all get names based on their point of origin. the so-called gladeiator fire has moved toward the historic mining town of crown king. residents there have been evacuated, and colorado officials have evacuated dozens of homes as the hewlett fire has burned thousands of acres, and the first wave of debris from last year's tsunami washing up on american shores. there's more to come, and today on capitol hill at a senate hearing, we learned what is sure to be a strain when the debris comes ashore in bulk. the states and not the federal government are going to be forced to pay for the majority of cleanup costs. still ahead as we continue

along the way tonight. if you're one of the patients who asks the doctor for a z-pack by name, something serious you should know about. and later, they called her the quine of disco. we'll remember the voice of a woman who helped define a musical era. our cells plays a key role heaf throughout our entire lives. we'll remember the voice of a woman who helped define a musical era. u of disco. we'll remember the voice of a woman who helped define a musical era. e of disco. we'll remember the voice of a woman who helped define a musical era. e of disco. we'll remember the voice of a woman who helped define a musical era. n of disco. we'll remember the voice of a woman who helped define a musical era. ♪ it has more of seven antioxidants to support cell health. that's one a day women's 50+ healthy advantage.

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chief medical editor, dr. nancy snyderman. >> in this busy emergency room in brooklyn, one of the most widely prescribed drugs is azith romicin. >> it generally has been a safe drug we have used for many years. >> also known as a z-pak, it's a five-day course of antibiotics prescribed for everything from sinus problems to brawn kooits. there have been reports of problems with this drug with heart disease. researchers s at vante er buile found it could increase the risk of cardiac death. >> we wanted to see if there was fire. and we found that there was. >> for patients who have heart disease, severe diabetes and other risk factors, the drug can

cause an abnormal and even fatal heart rhythm. >> we saw a relatively small number of deaths in the azith romicin user s but it was 2.5 times as many as would be expected. >> last year, doctors wrote over 55.3 million prescriptions. globally, sales were $1.8 billion. we are thoroughly reviewing this observational study and patient safety is of the utmost importance to pfizer. back in brooklyn, doctors still see it as an important medication. >> for my practice, i will be more vigilant in looking for signs of cardiac disease for patients for whom i'm preziebing it. >> patients should talk to their doctors about considering an alternative biotic, and for those with high cholesterol, the risk factors like diabetes, high blood pressure, anything else that can put your heart at risk

is a conversation worth having and a reminder, this is an antibiotic. it doesn't work for a common cold. not for viruses and a second-line drug of choice. >> this will now get the attention of all physicians. >> up next tonight, a new tipping point. something has just happened in america for the first time in our history. it changes our society forever. it says a lot about who we are. i woke up with this horrible rash on my right side.

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says mary kennedy, the estranged wife of robert kennedy jr. died from asphyxiation. she committed suicide. she was found yesterday hanging in a barn in the ground of their home. the couple's four children range in age from 11 to 17. all of them were out of the house when it happened. there is a new picture tonight of just who we are and how the face of america has just

changed, perhaps forever. a picture that is emerging in new census numbers showing that the word minority may no longer apply. our report tonight from nbc's anne thompson. >> the sound is the same. but how america looks is beginning to change. the u.s. census bureau says for the first time, minorities make up the majority of the population under the age of 1. 50.4% of these very young americans. though the nation's overall population is still prenomdantly white, minorities are in the majority in four states, hawaii, california, new mexico, texas, and the district of columbia. the biggest minority group is hispanics, followed by african-americans and asians. growing the fastest from 2010 to 2011, hispanics. up 3.1 persh, followed closely by asians, native hawaiians and

other pacific islanders and then african-americans. >> it's not just questions of race and culture. but really about how we think about the contributions that this diverse populous can make. >> brooklyn's medical center delivers 8,000 babies a year, the most in new york state. it prints information in ten different languages. and has on hand interpreters in 70 languages to meet the needs of its multicultural population. the changes that are seen here and across the country do not end at the maternity ward. there are potentially big impacts on our politics, our economy, and our education system. today, fewer hispanics and african-americans have high school and college degrees than whites, limiting their economic opportunities. >> when i think about the census data, i'm more concerned with class, poverty, issues of equity that cause this confliblth of

race. >> issues for all as the proportions in this melting pot begin to change. anne thompson, nbc news, brooklyn, new york. up next tonight, the unmistakable voice of donna summer is now gone. tonight, we remember her legacy and the music of an entire era. what makes the sleep number store different? you walk into a conventional mattress store, it's really not about you. they say, "well, if you wanted a firm bed you can lie on one of those. if you want a soft bed you can lie on one of those." we provide the exact individualization that your body needs. wow, that feels really good! once you experience it, there's no going back. at the sleep number memorial day sale, save 40% on our innovative sleep number silver edition bed-for a limited time. only at the sleep number store, where queen mattresses start at just $699. they claim to be complete. only centrum goes beyond. providing more than just the essential nutrients, so i'm at my best.

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tonight. donna summer, who pioneers pop songs with electronic backing that are among the staples of music still today and was the voice and face of the ira of disco in this country. she fought a long battle with cancer and died today at the age of 63. we have a look back tonight from nbc's rehema ellis. ♪ bad girls >> for generations of partygoers in the '70s and '80s, donna summer was the queen of disco. ♪ come on baby >> when billboard magazine created its disco chart in 1975, summer was consistently at the top. with songs everyone has come to know. ♪ she works hard for the money >>. ♪ looking for some hot stuff

>> summer is a five-time grammy winner with a star on the hollywood walk of fame. she even won an academy award for "last dance." she's considered the first cross over artist in pop music history. >> donna summer did more than anyone else to make disco cool, to make it out of the underground cluvs and on to the pop charts. it revolutionized pop music for a decade at least. >> born on new year's eve, she discovered her voice single gospel music as a child. >> i was in church and i started singer and all of a sudden, i opened my voice and this voice came catapulting out of my body. >> she made her way into musicals. >> i paid my dues. all i'm asking for is a dance. >> it was the sexy pop dance music sound that made her an international star. >> think her music, the anthems

she sang were anthems of equality and empowerment for everyone. ♪ last chance for love >> of all her hits, donna summer said "last dance" was her favorite song, a song that will keep future generations of fans dancing. rahiehema ellis, nb crunews, ne york. >> that's our thursday night