♪ because i'm happy clap along if you feel like that's what you wanna do ♪ if you feel like a room without a roof ♪ ♪ because i'm happy clap along if you feel like happiness is the truth ♪ ♪ because i'm happy clap along if you know what happiness is to you ♪ ♪ because i'm happy clap along if you feel like that's what you wanna do ♪ ♪ happy come on bring me down ♪ happy come on bring me down ♪ love is too happy to bring me down come on bring me down ♪ ♪ i said bring me down come on bring me down ♪ ♪ love is too happy to bring me down come on bring me down ♪ ♪ i said ♪ because i'm happy clap along if you feel like a room without a roof ♪ ♪ because i'm happy clap along if you feel like happiness is the truth ♪ ♪ because i'm happy clap along if you know what happiness is to you ♪

♪ because i'm happy clap along if you feel like that's what you wanna do ♪ ♪ because i'm happy clap along if you feel like a room without a roof ♪ ♪ because i'm happy clap along if you feel like happiness is the truth ♪ ♪ because i'm happy clap along if you know what happiness is to you ♪ >> jimmy: i want to thank channing tatum, paul feig, pharrell williams. apologies to matt damon. we ran out of time. it wasn't the right thing to do, but we'll reschedule him. tomorrow, dwyane wade, and tony goldwyn. thank you for joining us, good night.

tonight, on "nightline," inside one of the world's most foremost transplant centers, only a donor can give the gift of life. meet the incredible doctors and brave patients fighting overwhelming odds. very special delivery, a little boy who needs a new heart. and a young woman who dreams of starting a family. their journey is just beginning as they pray for the call that will give them a chance for a new future. and cry for help. the mother of trayvon martin says the voice in the background is her son. >> who do you recognize that to

be? >> trayvon martin. >> but so does the mother of george zimmerman. >> a hotly contested piece of evidence in an emotional day

this is a special edition of "nightline." gift of life, a new beginning. >> hello everyone, and thank you for joining us tonight. it is not that often that somebody is given a gift at a second chance at life. and right now, nearly 120,000 americans are waiting for just such a gift, the selfless decision by one family to donate organs and save the life of a stranger. for more than a year, my colleague, bill weir, has followed this subject. tonight, two of their stories from the agonizing wait to the

vivid drama of the operating room to the hope of a future on their own terms. >> reporter: it is a friday night at the mayo clinic, and a different kind of exciting friday night out for this family. because nine months after sitting on top of the waiting list, a donor heart is about to touch down at the rochester, minnesota, airport, a heart bound for the chest of their 9-year-old son. >> reporter: do you know what we're going to do tonight? >> why are you here? >> a heart transplant. >> reporter: are you all set? >> i am always set. >> that is good, he is going to be a surgeon when he grows up. >> reporter: but before he can do that, he needs the precious gift that is being transported in that red cooler. >> that heart is not going to weigh much. >> reporter: colter is one of the 120,000 americans waiting

for a heart, a kidney or liver because somebody, somewhere signed the card, checked the box, with the gift of life. >> when i was 19, i was diagnosed with the disease that led to congestive heart failure. >> reporter: a sweet as pie 30-year-old from duluth. she loves her job and desperately wants to start a family. but knows that both will have to wait while she waits, for a heart and liver. and a return to the simple pleasures of life. >> i can't burn candles in here, and i love to. they smell nice and look nice. taking a bath, i can't take a bath here. i just want to take a big jacuzz tub bath when i get out of here. >> reporter: but as they play the most fitting tom petty song of all, jessica will just have to keep waiting. >> you don't really know when it

is going to happen. you can't predict. you're living in the hospital. and you can think about, you know, the future. but it is hard to make any plans. >> reporter: advances in medical science have led to more patients being eligible for a life-saving transplant. we also saw how the parents of sarah murmahan took to the courts to fight for their girl. but there are simply not enough donors, so 18 people die every day waiting. but tonight, the wait is over for colter minor. again, this is the second time around for this family since jeff and patty learned their new little boy was born without the left side of his heart. >> that was the bath the nurse gave him before he went down for his transplant. >> reporter: colter had his first transplant at six weeks

old so he is smaller than many of the kids in his second grade class. and while he has all the pent-up energy of a 9-year-old, and loves star wars. >> make action figures. >> reporter: he also has his iv pump. >> i have is it because it goes through where my heart is. >> reporter: in recent years it became obvious that the donor heart may not last until age ten. >> one, two, three. >> there we go. >> reporter: so the family crossed fingers and the surgeons held out hope and here it is. a second, second chance. the mayo clinic is known for its team approach to medicine. so this surgical team moves with perfect timing. >> i'm bypass, we're excising the heart here now, and we'll be taking it out shortly. >> reporter: now if you are

squeamish, you may want to look away here. but if you are fascinated by modern medicine, behold, as colter's heart is removed and keeps beating for a few moments in a surgical bowl. this is hardly a novelty for the doctors, so they remain watching the bowl. it is as if the heart was custom made for the little boy. >> the heart is a perfect fit. >> reporter: a couple of days later, just look at him. a pint-sized jedi, ready for anything. >> there is just one problem that was wrong with the emperor. >> let's not talk about star wars. >> no, that is all right, dad, i have an 8-year-old, and she is obsessed. >> yeah, i love it, it is my favorite. >> you want to show him your scar? >> oh, my gosh, look at that.

>> don't touch it. >> here is what i would do if i was you, colter, on the playground, don't just show your scar to anybody who wants to see it. charge them a quarter. >> i will charge them $20s. >> reporter: so dad, what would you say to the family of the donor? >> thank you. >> that is about all you can say. >> otherwise we wouldn't have him here. >> reporter: down the hall, jessica danielson wrestles with the emotional toll of life at the top of the list. >> by praying for another heart i'm praying for another person to die. and that bothers me all the time. it is not my fault that this person is going the die. but it is still sad, no nonetheless. >> reporter: to cheer up, she sometimes takes wilson for a stroll in the halls. she named it after the movie,

castaway. because she often feels marooned, with pain and worry. >> reporter: think you will carry the added responsibility to live the life befitting of that gift? >> almost like you're going to be living for two people to know that i'm alive because someone else's heart is working for me. i don't know, it is kind of a beautiful thing. like the marrying of two souls. i don't know. i don't know how it works yet. >> reporter: when we come back, jessica's two coolers arrive. but will these gifts be enough to save her life? and will colter's second donor heart keep ticking? >> this special edition of "nightline" is brought to you by progressive. i'll just press this, and you'll save on both. ding! ladies and gentlemen, boys and girls, llllet's get ready

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patients on organ donation lists can wait for months, even years, before receiving their chance for a new beginning in the form of a potentially life-saving donor. and now, jessica danielson has her turn, the drama of the operating room is powerful. but for patients like jessica, it is the only path to any kind of future. for six months, jessica danielson has been cooped up at the mayo clinic, walking the halls with her iv pole, wilson, by her side. he supplies the medicine until a

new heart and liver can be found. >> i'm actually not scared of surgery, i'm pretty excited. because that will be the turning point for me. my dream is to build a family of my own. i still want to finish a college degree. i still want to get a great job. i still want to meet someone. you know, i want all of those things that any young person wants. and this is for me, this is that chance. >> reporter: and then suddenly, that chance arrives. a young woman has died somewhere far away. her heart and liver a perfect match. jessica is taken into the operating room and put on a bypass machine, a mechanical pump to take over the work of lungs and heart during surgery. >> this pump is for the heart. >> reporter: as they did with little colter, the surgical team at mayo clicks together. >> and now we're move at getting the heart out. >> reporter: eyes on the clock. >> they will be done in five minutes. >> taking the heart out. >> reporter: and after six months of waiting in the

hospital, jessica's red cooler finally arrives. >> right now, it looks like a very nice heart. small and feels very nice. >> reporter: just like that, a broken heart is removed, a new one put in its place. >> it will be okay. >> reporter: but their preparation and skill are only. >> jessica is taken off the bypass machine, as the new heart takes over its job. >> we need this to be a strong heart because we're going to do an immediate liver transplant for her. and this heart needs to be strong enough to tolerate what is a very big operation. >> reporter: that is right, jessica's drama is only half way done. because in that blue cooler is a liver from the same donor as the perfectly matching heart. like a brilliant tag team, the heart doctor goes to talk to the

family. >> i'm doctor daley. >> reporter: the liver team takes over. but just when everything seems textbook proper, there is bleeding, lots of it. and it is coming from her chest, the site of that precious new heart putting out new beats in a different body. the heart team rushes back. >> we need a tester. >> reporter: the bypass machine, reattached. all the better to find the source of the bleeding and hopefully stop it. >> the power is going to be right there. >> reporter: and there is a wave of relief when they realize the new heart is not the source of the hemorrhage. >> that is good. some bleeding that came up inside the chest, it is an area that is very fragile in her situation from the previous surgery and then developed some bleeding which took our team to get control of. >> reporter: this moment is true

that while groundbreaking medical science happens, no two operations or patients are the same. just look at colter, a year after getting his second donor heart. for him, life is good. the scar has healed, and he didn't make a lot of money off of it, after all. and while he has not grown a lot. chasing around his brothers, it is clear he has energy to burn, and no march iv pump to drag around. after a summer of camping he will be off to fourth grade in the fall. >> we're glad he is back to himself and running around, playing, not hooked up to any machine. >> reporter: after more than 12 hours of surgery, jessica has her new heart and liver. >> her vital signs and things look good, and the heart function looks good. >> reporter: within days, she is walking, with a lot of work ahead. she will spend three months in rochester adjusting to her new

organs suffering with the terrible headaches that come with her medicine. but as weeks turn into months she changes in ways that surprise even her doctors. >> you look great. oh, my goodness. oh, my goodness. you were so skinny -- >> uh-huh. >> reporter: heart biopsies look for the slightest sign of reinjection, tests show how the blood inside the heart is working. >> it is the gift of having a new life. >> reporter: and this is what a successful heart/lung transplant patient looks like a year later. >> my life today compared to my life just over a year ago from now -- i mean, yeah. i just -- i never imagined i could be this happy. and this healthy. >> reporter: jessica is now back home in duluth, walking grocery aisles instead of hospital wings. >> i love guacamole, that is my

favorite thing. >> reporter: and no more wilson. >> i am having a barbecue to celebrate all of my friends who were so supportive and there for me. >> reporter: her friends can't get over the transformation. even she looks in the mirror and sees a better person. >> you definitely have a different appreciation for life. this experience showed me what was important in life. >> reporter: she is back to work at wdio, the local affiliate in duluth, running the floor and the news cast just the way she likes it. >> never gets old. >> she came down to see somebody working in graphics and they didn't recognize her at first. >> reporter: and jessica has somebody new in her life, as well. a boyfriend, of just a few months, but already, a close bond. >> you look at the world around

us, there is a lot of bad things out there. she reminds you it is not all bad. >> reporter: and all of it due to gifts fromñi a stranger she will never be able to thank. >> i'm so grateful to her and her family. i'm made of two people. i didn't just survive. i'm thriving. and that is a miracle. >> reporter: a miracle, thanks to my co-anchor, are bill weir for that story, and to the mayo clinic. good luck. next. is that voice on the 911 tape trayvon martin's or george zimmerman's? a courtroom clash pits mother against mother when we come back. even get through the day. so i was honest with my doctor. i told her i'd been feeling stuck for a long time. she said that for some people, an antidepressant alone only helps so much and suggested we add abilify (aripiprazole). she said that by taking both, some people had symptom improvement as early as 1 to 2 weeks. i wish i'd talked to my doctor sooner. [ female announcer ] abilify is not for everyone.

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yes honey? dad told me that cheerios is good for your heart, is that true? says here that cheerios has whole grain oats that can help remove some cholesterol, and that's heart healthy. [ dad ] jan? ♪

murnag . >> how much would you pay for a lock of mick jagger's hair? what went very wrong at a fourth of july fireworks show? and whose voice was on the 911 george zimmerman call? all questions in tonight's feed frenzy. tumultuous testimony in the courtroom, in the george zimmerman trial, it hinged on this piece of evidence. this 911 call recorded in the last minutes of trayvon martin's life during his fatal struggle

with george zimmerman captured one man's cries for help. but whose? trayvon martin's mother says it is her son. >> who do you recognize that to be? >> trayvon martin? >> while george zimmerman's mother claims it is her son. >> whose voice is that? >> my son's. >> today, the prosecution rested and the defense began to call its witnesses. the trial continues next week. fireworks, fiasco, millions of americans look forward to the pyrotechnic displays in the sky, but in simi valley, california, a celebration went very wrong when people were taken aback by the blasts at close range. reportedly, the platform holding the fireworks toppled over, shooting projectiles. thankfully, nobody was