Her children was eight months pregnant. The medical examiner adding that unborn child to the murder count. It was premeditated, it was calculated, it was planned. Its just a brutal murder. Reporter police say the first shooter approached the his victims toward the porch. Thats where a second shooter with an ak47 he then shot the victims in the head execution style. Neighbors are in disbelief. Bad for anyone to get murdered. Mothers being slaughtered like this, it takes it to another level. Reporter the family says four Young Children were inside the home at the time, one watched as his mother was shot dead. I got the emptiest feeling inside. But i love my grandkids, so thats what keeps me going is my grandkids. Proert police did find physical evidence here at the home. They hope will help them identify one of the killers. Tonight both of them motive is unclear. Lester . Blake mccoy, thank you. Heads are turning tonight in washington. The white house abuzz amid a starstudded state dinner to welcome the young new Prime Minister of canada, a leader who carries one of the most famous political names in the history of our northern neighbors. Nbcs ron allen on the diplomacy and the excitement. Reporter today at the white house, president obama welcoming canadas obama, Prime Minister justin true doe, the head of state turning heads. Ive never seen so Many Americans so excited about the visit of a canadian Prime Minister. Reporter just 44, with a young family, stunning the world with his victory last november, following the path of his father, pierre trudeau, justin, a former boxer, now a political heart throb. Do you think hes dreamy, too . Is that a word youd use . I might. I might use dreamy. Reporter emily covers the d. C. Social Washington Post. The same sort of celebrity culture that surrounded obama, youre seeing that with the Prime Minister. Reporter trudeau has jumped in the campaign 2016, dubbed the antitrump. Inviting americans who flee if trump wins to canada. But today he would not take sides. I have tremendous confidence in the american people, and look forward to working with whomever they choose to send to this white house. Reporter a state dinner, 200 guests, celebrities like Ryan Reynolds and blake lively. Serious issues like trade, defeating isis on the agenda. Graying elder statesman passing the torch to a new star on the world stage. Ron allen, nbc news, the white house. Turning overseas now, a purported secret files appear to have identified identities of thousands of isis fighters. It comes from forms a applications stolen from isis. And its giving us a rare look at just who is willing to fight and die for the isis cause. We get more from nbc news chief foreign engel. Reporter isis is fiercely protective of its secrets, and defectors, if caught, are generally executed. So this apparent leak starting to lose control. The German Federal police has already said that the documents appear genuine. But its an enormous and unprecedented trove of information, which experts are still sifting through. I think they probably are authentic, these documents, because they contain a great deal of detail thats been verifiable, can be verified. Reporter there are thousands of these forms which carry the isis seal, and list detailed information about isis recruits, including their names, nationalities, and whether they chose to be fighters or suicide killers. In a preliminary documents, which date back to 2013 and 14, we identified six that name americans. Including one Douglas Macarthur mccain from san diego, which nbc news first reported was killed two years ago. The name on the form is not a perfect match, but his date of birth and hometown are. Who the recruiters were. So to me, that seems to be the single most important and significant thing. Reporter this syrian man said all this information was on a memory stick he stole from a senior isis commander, and then smuggled out of syria. I put it in my babys diaper, he said, because i knew they wouldnt search there. We met him in turkey where he is now in hiding. He didnt tell us his full name, preferring to be called muhammad. Why exactly did you steal it . I took the memory stick so that one day i would be able to expose isis, he said, Important Information on it. He said he joined isis early on, and so was a trusted member of the groups internal security service. But he became disillusioned. I saw rape. I saw them butchering children in front of their mothers, he said. Some analysts raised doubts about the awe authenticity of the documents. Two Security Experts told us they do appear genuine. Lester . Richard engel, thank you. Still ahead flight. A brawl breaking out on a packed airplane caught on camera. What the airline said passengers were doing onboard that triggered all this. Also, the dangers of springing forward. Why turning the clocks ahead can increase Certain Health risks, were back now with the wild brawl aboard a packed flight. Fistthrowing passengers caught on camera, right in the middle of the aisle. It left the surrounding passengers shocked and had the police and fbi scrambling to respond. Nbcs Miguel Almaguer has the tale of the tape. Reporter passengers on flight 141 called it fight night. There was serious punches. Reporter a brawl breaking out between five female passengers. The stewardess even got punched. Thats when i stepped in. Reporter the a Spirit Airlines flight from baltimore to los angeles, ending in hairpullinging and flying fists. Two customers appeared to be intoxicated, playing loud music on a boom box. Other customers asked them to turn down their music. The ladies refused and said, what are you going to do . A fight broke out. Police boarded the plane. All five women detained then released. The friendly skies, not so friendly anymore. Our aircrafts are fuller than ever, people are closer together. The incidents leading to an air rage incident are higher than ever. Reporter a fellow passenger said he was drunk, to a belligerent man refusing to leave his seat. Flight attendants say unruly passengers are the toughest issue they face. There are fewer of us to deescalate the situation. Reporter an ugly problem becoming far Miguel Almaguer, nbc news, los angeles. And we are back in a moment with a huge fireball caught on camera that rocked the caught on camera, a massive explosion just outside cleveland. At least one propane tank went up in a huge blast after catching fire at a construction site. First responders were at the area at the time of the explosion. Fortunately no one was hurt. The cause of the fire is under investigation. Dont forget this weekend is when we turn the clocks forward. That, of course, means we lose an hour of sleep. But experts also caution that the switch to daylight increase the risk of heart attack or stroke for Many Americans. Nbcs erica hill explains why. Reporter its a seemingly small change with a big payoff. And a rude awakening. Losing that hour of sleep for Daylight Saving time each spring is more than a tough adjustment. The two days after the clocks move forward, theres a spike in the number of heart attacks, strokes and vascular events that occur. Phenomena. Reporter Research Shows in the two days after we spring forward, heart attacks can surge as much as 24 . And for those over 65, the risk of stroke increases 23 . Biochemist martin young is an expert on the bodys circadian rhythm. In terms of biology, Daylight Savings time is a terrible thing. Reporter the abrupt change in the bodys timing changes the bodys chemistry, which can aggravate Blood Pressure and produce more blood clots, making certain people more vulnerable. You would have to have a condition such as atherosclerosis, diabetes, in order to increase your risk of having a heart attack. There are certain things we can do to limit the risks. You should start now. Start going to sleep a little earlier every night beginning now and youll be ready. Also, exercise. Cut back on the caffeine, cut back on alcohol. And start destressing. Reporter the good news, come november, the hour we gain from falling back, lowers those same risks. Erica hill, nbc news, new york. When we come back, as the public pays last respects to nancy reagan, the stories finally tonight, thousands more pay their last respects to nancy reagan on this final day of public mourning before her private funeral tomorrow. She leaves behind a life in pictures. Many of them snapped by pete sousa, the white house photographer for the reagans and now the obamas, who shares the incredible stories our andrea mitchell. Reporter they are the iconic pictures of a first lady. I liked her. A lot of people thought she was tough as nails. But as long as you were straight with her, she was straight with you. Reporter and a portrait of a marriage. They were exactly the same way together, behind the scenes, as they were in public. It was very much a very true love and companionship between the two of them. Reporter the man behind the camera, white house photographer pete sousa. Eyewitness to history from the frivolous in another 50 years, how will we explain this picture . Who is this man dressed up in his blue suit . Why is he wearing one white glove . Reporter to the royals. If you look close, she is blushing. Reporter to the personal. Mrs. Reagans recovery from Breast Cancer surgery. Summits that went well, and those like this one in iceland that went so badly, mrs. Reagan rushed out to greet her husband when he arrived at Andrews Air Force base to make sure he was all right. And mrs. Reagan said to me, hows ronnie . How is he doing . Reporter pete sousas final trip with nancy reagan is when the family brought Ronald Reagan back to washington for his state funeral in 2004. As you look at that picture, shes talking to her husband. Reporter now back at the white house, as president obamas official photographer. But accompanying Michelle Obama to Nancy Reagans funeral. Youll be there to say goodbye . And to photograph. Thats what i do. Reporter capturing a first lady he followed in life, and now as she and her husband are reunited. Andrea mitchell, nbc news. And that will do it for us on this thursday night. Im lester holt. For all of us at nbc its friday, march 11th. Coming up on early today, whiplash for the first time the republicans squard s s squared off in what was a Civil Exchange of ideas and policies. Whats happening at trump ral rallies rallies . Well introduce you to an isis turn coat. And an incredible scene in one ohio town. Preparing a good bye to nancy regan. And a night to remember that white house. Early today starts right now. A rare civil meeting among night. This one focussed more on policy than name calling. The suvilt of civility of the night was not lost on donald trump. I would say were all in this together, were going to come up with solutions and find the answers to things and so far cant believe how civil its been up here. Reporter trump and cruz were quick to name this a twoman race and cruz backed up his views not shared by kasich. Its simple math, be to the republican nominee, youve got to get the 1237 democrats. Theres only two of us that are on the path to do so. These things are changeing all the time and im going to be fortunate enough to win ohio. All eyes turn to tuesdays primaries with kasichs home state of ohio and rubios own total of 358 delegates up for grabs. Later today, ben carson will indorse trump and after the debate, trump spoke about what it means to him. Great guy, respected by everybody. Liked by everybody. I was just a very wonderful thing. Meanwhile, a vicious punch thrown at a protester at a trufrm trufrm trump rally has led to charges. And a reporter claim she was physically man handled. The Trump Campaign strongly denies it. Reporter stunning new video capturing a trump supporter sucker punching jones in the face, after they were escorting jones. Jones yelling that crowd before he was blindsided. Get out of here. Reporter sheriffs deputies walking by the attacker and going after jones. As soon as i turned, he hit me in my eye. Reporter 78yearold was unrepentant. I knocked the hel out of that big mouth. The next time we see him, we might have to kill him. Reporter he was arrested and charged with assault. The Trump Campaign says the incident was unfortunate, that they have no control over their supporters behavior and take significant members to keep attendees safe. Still, its the type of behavior some feel trump has encouraged. Whos protesting . Anybody . Oh, good etout out of here. You know what they used to do to guys like that, theyd be carried out in a stretcher, folks. I promise you i will pay for the legal fees, i promise. Reporter new allegations that hit even closer to home for manager aaccused of roughing up a reporter. Michelle fields for um s s tweeted this photo of bruises after she says she was pulled down by the arm following the trump news conference. Trump Campaign Says its false. And questioning whether fields accusation is part of a larger pattern of her exaggerating incidents. And a Washington Post reporter says he witnesses the incident and supports fields story. And trump stood by the campaign manager. I dont know anything about it. I just heard about it a little while ago for the first time. I dont he would ever do a thing like that. I just got to see the little clip. He threw a punch but hes an impassioned person and i guess he didnt like what he was seeing but we dont condone it. Meanwhile, Hillary Clinton says the cumotion has not been lost on leaders. Ive been calling calls from a lot of the leaders i know around the world and their basic message is what is happening . And last night, influential democratic senator, Elizabeth Warren echoed those sentiments. Whats the problem with the two guys they have at the top . These are both people who basically deny the legitimacy of attack, they demean millions of americans and thats what identifies them as extremists and why republicans man, republicans in the senate are breaking apart over this. Now to the raging floods in the south. The death toll raises to five. Thousands of families have been evacuated as relentless rain has overwhelmed cities and towns. Over 20 inches in some areas. And in monroe, louisiana, fish were seen swimming along sidewalks. And the flood gates opened in louisiana. The president and first lady hosted canadian and his wife at the white house last night for a state dinner. And dressed to the nines, they greeted the counter partseir the north before dining michael j. Fox, and ryan and actor, mike meyers and snl creator, Lauren Michaels p. Prime minister says were more than friends. Were more like siblings, really. Weve shared parentage, though we took different paths in ouryears. We became the stayat home type. You grew to be a littlellious. Now to this, caught on camera, massive explosion outside of and after catching fire at a construction site, First Responders were in the area at the time of the explosion and no one was some restaurants and businesses had to be shut down. So far the cause of the fire is not known, its under