On this sunday night, warning signs. New details emerge about the teenager who went on a shooting rampage at his colorado high school. What fellow students are now saying about his behavior before the shooting. Search for answers. The body of a former nfl star is exhumed. A new effort to determine what triggered a tragic murdersuicide a year ago. Shoppers beware. How the apps you use to search for bargains are also being used to spy on you. And remembering peter otoole. Well look back at the famed actors long and successful career. Good evening. First the shot. Then the shock. And now the hard ques there war . The question friends of the teen who opened fire in his denver Area High School on friday are wrestling with tonight. 18yearold karl pierson took his own life after storming into his high school and shooting a classmate, severely wounding her. Now a friend of the shooter is telling nbc news that pierson had grown angry and had made threatening remarks about the teacher who police think was his prime target. Nbcs ron mott spoke with a friend today. He joins us from centennial, Colorado Work brand new details on this story. Good evening. Reporter hey, lester, good evening to you. A darker image of karl pierson is emerging from one of his classmates who said he thought he knew him pretty well. They spoke last monday about pierson possibly coming back to the debate team. He said he scrunched down in the hallway when the shots rang in the hallway before breaking down when he found out the shooter was his friend, karl pierson. My first instinct is to want to defend him but i know thats wrong. It is indefensible, what he did. It is horrible. It is hard to process those emotions. Im karl pierson at arapahoe high school. Reporter cocaptains on the debate team werent Close Friends but he felt close enough to help him. Speech and debate was his life and the fact he was not there crushed him a little bit. It made him tense and angry. Reporter it had been a stressful fall term for pierson. He had grown angry from losing his coveted spot on the team months ago which made the coach, the librarian a wanted man in piersons eyes. Karl and murphy did not get along. Whatever it was escalated to a death threat. His intent was evil and his evil intent was to harm multiple individuals. Reporter police say pierson stormed into the school heavily armed, prepare to hurt many more than just one person. As he moved toward the library looking for murphy, he shot 17yearold claire davis in the head point blank, eventually turning the weapon on himself. The karl that i knew was a good person but obviously the karl that came into School Friday was not. Reporter the violence only added to the disbelief and pain in a community especially hard hit by deadly spree killings. Columbine in 1999. 13 dead. A Movie Theater in aurora just last year. Another 12. Today colorados governor echoed what many have expressed here. What in the world is going on in the denver metro . God only knows. There is no rational explanation for it happening here. Im sick of it. Ive had enough of this. Everyone in colorado has had enough. Reporter he said he has talked nonstop to classmates on friday hoping to make sure no one internalizes the trauma when help is all around. I did try to help him and i didnt get to him. And other people tried to help him and didnt get to him. And i think there are so many people in my school that were supportive of him but no one was able to get to him. At the end of the day, thats what happened. Reporter joel said he talked to a number of students and a number of students have gone into what he calls a shell. He is encouraging everyone to talk to counsellors and one another. In the two days since it happened, he said it has really helped him. Thanks very much. A Major New Development involving a star nfl player who shot and killed his girlfriend and then himself last year. The body of Kansas City Chiefs linebacker Jovan Belchers body has been exhumed. They hope it will determine whether a brain injury was a factor. Reporter more than a year after the murdersuicide, his family still wants to know why. Ordering the linebackers body exhumed so his brain can be examined for chronic traumatic encephalopathy. He killed his girlfriend, the mother of his 3monthold daughter. Okay. They were arguing and he shot her . Yes. Yes. They were arguing. Reporter then in the parking lot of the chiefs practical facility, shot himself. At the time his family mourned the man they knew. His kindness, humility, respect and gratitude for family and friends were steadfast. Reporter now they wonder if his years on the field could have damaged his brain. He had a lot of hits as a linebacker. Probably including a lot of concussions that went undiagnosed or unreported. Reporter doctors at Boston University recently reported finding cte in the brains of 52 of the 54 deceased nfl players they tested. We know in many cases how this manifests itself. Suicide, dementia, severe memory loss. Reporter last year retired nfl great junior seo committed suicide. His brain pathology confirm cte. In 2011, the bears safety shot himself in the chest leaving a note donating his brain to the nfl brain bank. It too showed cte. Experts say a similar diagnosis for belcher may not explain everything. Even if Jovon Belcher is bound to have cte, that doesnt mean it was the cause of the murdersuicide. Reporter but his family hopes it is a step toward understanding what led to the unthinkable. Nbc news, new york. Much of the northeast spent the day digging out from a powerful prewinter storm that left a foot or more of snow in parts of new england after dumping seven inches yesterday on detroit and six inches on new york city. The storm is blamed for at least four deaths in traffic accidents. It also caused hundreds of flight cancellations. Airlines are still struggling to get back on schedule. Now to syria where the bloodshed and suffering from the nearly 3yearold civil war shows no end. Government air strikes today on rebel controlled areas in the Northern City of aleppo reportedly killed 37 people, including 16 children. Meantime, harsh Winter Weather is setting in, adding to the crisis. Especially among the more than 2 million syrians who have fled. They include those in a refugee camp across the border in northern lebanon, just visited. Reporter a miserable winter in a devastating war. Syria blanketed in snow. The fighting is relentless. In battlescarred aleppo, children, including some infants have frozen to death, according to an opposition group. Families that fled syria have only flimsy tents of protection even where there isnt snow, it is still bitterly cold. Each one of these makeshift tents are home to at least one family. And there are hundreds of camps like this. Thousands of families. An estimated 1 million Syrian Refugees in lebanon alone. And they feel utterly abandoned. And desperate. Mothers cling to children and grams for food vouchers. This one in northern lebanon, theyre feeding 1,300. Among them, 8 mold and her mom who escaped bombing. She left her husband behind, she tells me in a threeyear war no one is winning, she cannot know when theyll be reunited. She passes the free blankets. Theyre not for her family. They are for those visit in even colder conditions. She is gathering firewood to try to keep her six children warm. They have only one blanket to share. This is where you sleep. All of your family. There is no comforting her 2yearold daughter. Amnesty International Said western leaders should hang their heads in shame for the pitiful help they have offered these people. While the war grinds on, the rebel fighters supported by the west are losing ground and refugees who look to america for help are losing hope. Nbc news, lebanon. South africa bid an emotional farewell today to Nelson Mandela marking the end of a tenday mourning. It was following a state funeral held in the humble village where he spent most of his childhood. Richard engel was there. Reporter it was the final stop on a long journey. Where Nelson Mandela asked to be buried in the small village where he grew up. It was a grand state sendoff. But also a private farewell. In a massive tent by the Mandela Family graveyard, a few thousand invited guests, extended family, world leaders, old friends, Prince Charles among the mourners, oprah and richard branson. He went to school with bare feet and in the end he rose to the highest office of the handled. It is within each us to achieve anything we want in life. Reporter ahmed spent years jailed with Nelson Mandela. I have lost a brother. My life is in a void and i dont know who to turn to. Reporter in life and now death, mandelas journey is the founding myth on which modern south africa is built. All across the country, crowds gathered to watch on large screens. These people were not invited to attend the private ceremony but wanted to participate together. At least watching on it a big screen to mourn the passing of a man and the passing of an era. South africas current president , jacob zuma,ments criticized for failing to live up to mandelas moral standard. Vowed to carry on the legacy. The long walk to freedom has ended in the physical sense. Our own journey continues. Reporter and then at noon by tradition, when the sun was highest, the shadows shortest, he was let go. And south africa said Nelson Mandela was finally free. Richard engel, nbc news, south africa. President obama of course paid his respects to Nelson Mandela when he spoke at a Memorial Service in johannesburg on tuesday. You may have seen these photos released by the white house, taken aboard air force one on the way to south africa. President bush and his wife laura, secretary of state Hillary Clinton traveled with the obamas. Official photo releases like these are not. Reporter now at the central of an escalating battle between the white house and the news media over access and image control. Our White House Reporter has more. Reporter this sumter president and his former secretary of state had lunch at the white house. A newsworthy event. The news media werent invited in. Only the one given access . The official white house photographer. Were the first eyes and ears for the public. If were not getting access to the president , the public isnt getting access to the president. Reporter he calls images like these pure prop ganld a. Arguing the Obama White House consistently blocks journalists from events they routinely covered in previous administrations. The most recent example, those photos of the Historic Air Force one trip by two president s to Nelson Mandelas funeral. Captured only through a white house lens while the press corps was in the back of the plain. The white house is getting the only control. Reporter 30 news organizations recently joined in a letter to the white house charging the administration is blocking the public from having an independent view of the executive branch of government. Last week the fight boiled over in the Briefing Room with press secretary jay carney insisting the president values the independent media. Were going on work with the press and the photographers to try to address some of their concerns. Reporter historically president s have tried to control their image through official photos but social media has made this governments pr push a lot easier. The availability of twitter, flicker, allows them to do it without any filter of the media. Reporter it is not only the press cameras being shuttered. Denying the media unscripted answers that might be news worthy. His promises, consistent promise of a Transparent Administration led people to believe that the access would be different. That it would be greater. Reporter now a study by the university who you just saw there, found president obama answered fewer shouted questions than president s bush or clinton but has had more oneonone interviews. Press secretary jay carney will meet with journalists to discuss it on tuesday. Thank you. When nbc nightly news continues, why you may be getting more than you bargain for when you use your mobile device to hunt for the best deals. And later, how some of santas good job still running in the morning . Yeah. Getting your vegetables every day . When i can. [ bop ] [ male announcer ] couldve had a v8. Two full servings of vegetables for only 50 delicious calories. See who does good work and compare costs. 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For those of you who havent started your Christmas Shopping yet, there are just nine shopping days left. We have a warning for bargain hunters. The apps you use to find the best deals are also being used to find out a bit more about you. Reporter chicago and Maureen Brown is hitting the stores this holiday season. Lets see. Reporter smartphone in hand. I have the best buy app, target, cvs, wall greens. They send you coupons and let you know what kind of deals theyre offering. Reporter at sears it is part social network. There are people who checked in and give tips. They give tips. They can post surveys, you can say which of these shirts is more fashionable. Reporter this year more shoppers than ever say theyll use smartphones to use more about stores but at the same time, stores are using our phones to learn more about us. Apps like shop kick already alert 6 million users to deal whens they walk into more than 7,000 stores. Like best buy, target, jcpenney. Very soon if you let them, theyll foul as you shop at select macys. We can send customers notifications about products they love as theyre standing right near that product. Reporter the Analysis Firm retail next can follow a smartphones wifi signal to follow traffic, even seeing how many people walk past the door. We can get those numbers and we can understand. Wait a minute. What do i need to do differently to get more customers to come into the store . Reporter if that feels too much like big brother, shoppers can disable their wifi. A consumer that knows exactly what they want out of an application and exactly what he or she is willing to give up in materials of privacy or other information can get a lot out of these applications. Reporter for Maureen Brown, sharing her name, email address and Shopping Habits is part of the deal. We put so much information out there blindly. To lots of people were part of the problem. 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The sad news came from his agent, actor peter otoole died peacefully saturday at a London Hospital following a long illness. He was 81 years old. His film and stage career spanned more than 60 years. We get more from nbcs jim maceda. Reporter peter otoole began his career as a bright young star of the british stage but the world came to know him with those piercing blue eyes in lawrence of arabia where he played the british officer in world war i, landing otoole an oscar nomination as best actor in 1962. You look great. Nine centuries ago. Time to be great again. Reporter otoole was good again and again winning seven more Oscar Nominations including for his 1960s roles. Goodbye mr. Chips. You all hated me for this but i am very particular. Reporter he held a dubious record. The most Oscar Nominations without ever winning one until an honorary award in 2003. He did point out that he was the son of a book maker, the guy who bet on race horses. And i think he sort of appreciated the irony in his own lifetime, peter otoole was never a sure thing. Reporter he was known for his krousing and heavy drinking. He gave up drinking after a bout of pancreatitis almost killed him. Tonight film and theatergoers in londons west end were saddened by the news. It is a sad loss in the Film Industry and as an actor. He was so renowned and well respected. Reporter two years ago he was honored by hollywood. Peter otoole, rakish, sue people areally talented, one of the best actors of his generation. Still ahead, the holiday as generation. Sshes always been abley as to brighten your day. Its just her way. But your erectile dysfunction that could be a question of blood flow. Cialis tadalafil for daily use helps you be Ready Anytime the moments right. You can be more confident in your ability to be ready. And the same cialis is the only daily ed tablet approved to treat ed and symptoms of bph, like needing to go frequently or urgently. 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Finally tonight, some of the of some of santas helpers have been busy decking the halls to make sure they are brighter than they otherwise might be for some struggling military families. Janet shamlian has this festive house call. Reporter on a brisk colorado morning, an early christmas at the home of airman Matt Anderson and his family. Were going to do a great christmas to make your life more enjoyable. Reporter despite pleas from their two sons, they had given up on the idea of decorating their home. The 5yearold has been fighting for his life after a leukemia diagnosis changed his life six months ago. Your chest just drops. Youre thinking, no it is just pneumonia or something. Theyre wrong. Reporter the starting news prompted him to stay home facing battle zone deployment and trips in and out of the hospital for chemotherapy on. This day for this family, christmas cheer arrived. What a great way for us to do something to give back. To say thanks. Christmas decor started decorating soldiers homes. They are among 100 getting the full decked out treatment this season. For the military families it is always a surprise. Especially for the children, it is like christmas came early. For nate and older brother ben, it was as if santa himself stopped by and maybe he had. It was amazing just to see. A crew of 10, 15 guys super excited. Theyre all here for us. Reporter even with his home transformed into something out of the north pole, he never lost sight of what this was really all about. What is the best part about the holidays . The best part about the holidays is family. It sure is. Having a break from school and getting to ride my bike around. 3, 2, 1 Merry Christmas reporter thanking those who served by brightening their holiday. Janet shamlian, nbc news, aurora, colorado. Thats nbc nightly news for this sunday. Stay tuned for football night in america followed by the Cincinnati Bengals versus the pittsburgh steelers. Brian williams will be here tomorrow. Im lester holt reporting from new york. Well leave with you a special holiday concert featuring scores of tuba players right outside our rockefeller studio