>> blake mccoy, thank you. >>> heads are turning tonight in washington. the white house abuzz amid a star-studded 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. nbc's ron allen on the diplomacy and the excitement. >> reporter: today at the white house, president obama welcoming canada's obama, prime minister justin true doe, the head of state turning heads. >> i've 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 he's dreamy, too? is that a word you'd 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, you're seeing that with the prime minister. >> reporter: trudeau has jumped in the camp

nbc's blake mccoy now with details. >> reporter: it was in the cafeteria of madison junior senior high school where authorities say a student opened fire on his classmate. one student managing to call 911 from a high school. school. there's a shooting. >> okay. >> he's got a gun. he started shooting people. >> how many people did he shoot? >> i'm not sure. he just pulled out his gun and started shooting. >> reporter: two students shot at lunchtime, two others injured in the chaos. lockdown as frantic parents raced from work. >> we had to get here. had to get to him. >> serious mindset and just trying to be quiet and keep everybody else around me safe. >> reporter: cool is in middletown, ohio, about an hour north of cincinnati. the two students shot, 14 and 15-year-old boys, were flown by helicopter to the hospital. >> they are both basically stable at this time. >> reporter: attention now turns to the accused shooter, a 14-year-old male who police say tossed the handgun as he ran from the building. he's been charged with two counts of attempted murder, a motive unknown at this time. >>

blake mccoy, nbc news, chicago. >>> and still ahead here tonight, a growing epidemic that kills dozens every day. the unprecedented action the cdc is taking to combat a danger that americans too often find into. >>> also, heads of state. behind this surreal >>> we're back now with what the centers for disease control call an emdeckic of growing pain pill addiction. people getting pain bills after an injury or surgery, millions getting hooked and on average a million people are dying every day from overdoses. nbc's tom costello has the health alert every family should hear. >> reporter: from the cdc today a nationwide health alert. the country, it says, is in the midst of an endickic of pain killer abuse, strong opiates with names percocet, oxycodone and oxycontin and now the cdc is urging doctors to reconsider whether the opiates they prescribe are really necessary. >> reporter: these painkillers are very addictive. they are opiod medications and have the same chemical properties in it as heroin. >> reporter: in jacksonville, sarah willons, a mother of four was taking up to 35 hydrocod

blake mccoy, nbc news, chicago. >>> this will's late word that the world's busiest subway system will reopen at 5:00 a.m. in an unprecedented move the d.c. metro was shut down for emergency inspections and repairs. as nbc's tom costello plains is it's just a symptom of our crumbling infrastructure. >> reporter: a stressful commute in the nation's capital today. >> a drastically different day for commuters who normally ride the rails. >> reporter: has hundreds of thousands of subway riders turned to car pools or buses or teleworked from home. the entire system shut down. safety crews today found two dozen frayed and charred power lines after an monday and a smoke one. nine dead in a 2009 crash. >> none of us have in good conscience could send the trains out even with full knowledge of the participants of what the situation was knowing the risks that we had. transportation experts say d.c. is symptomatic of systems nationwide with backlogged maintenance now totaling $86 billion. >> the 40-year-old system is a worn out system unless you invest in it >> reporter: not just subways, a quart

blake mccoy, nbc news, chicago. >>> an american who traveled overseas to allegedly fight for isis has been captured in iraq. kurdish fighters say he was trying to flee isis when he stumbled into kurdish-held territory. it was all news to the man's family back here in the states who say they were shocked when they learned what he had been up to. we get more from nbc news chief foreign correspondent richard engel. >> reporter: this, according to kurdish fighters, is video. moment after an isis deserter surrendered himself to them, when they asked him where he was from, he said simply united states. >> united states. >> reporter: the kurds say they found this virginia driver's license on 26-year-old mohammed jamal quase. his uncle told nbc news they thought he was on vacation in europe. he crossed the turkish border a few months ago and joined isis and when the kurds asked where he had been he answered -- >> mosul. >> reporter: mosul, now an isis stronghold in iraq. last week, this man who said he's an isis defector, provided nbc news with a cache of documents he claimed he stole from th

nbc's blake mccoy has more. >> reporter: super bowl 50 now becomes a storybook ending to a storied career. >> there's something about 18 years, 18 is a good number, and today i retire from pro football. >> reporter: peyton manning has seen a lot of good numbers, first with the indianapolis colts and then the denver broncos. named league mvp five times, manning has the most career wins ever by a quarterback at 400, two of them super bowls and he's the all-time leader in touchdowns and passing yards but manning's legacy one beyond statistics. >> peyton manning was really the first quarterback who came out of the huddle and almost turned football theater. >> there are other players who are more was no one who could outprepare me, and because of that i have no regrets. >> reporter: off the field manning's wholesome image and southern charm made him a natural pitch man. in recent months manning pushed back hard against two allegations that threatened to tarnish that image, a report suggesting he used human growth hormone and a sexual assault claim from his college years. >> i did not do what >

here's nbc's blake mccoy. >> reporter: heavy snow blowing in so hard and fast today in denver, the airport forced to shut down completely. officials saying conditions had become unsafe. passengers already at the airport told to shelter in place. the road to go home impassable. across colorado, zero visibility. interstates shut down stranding drivers. state patrol tweeting, when tow trucks and fire trucks are getting stuck, it's bad. this express delivery ground to a halt. it's weather whiplash for colorado which saw temperatures in the 70s this time yesterday. the monster storm prompting advisories from the rockies all the way to maine. >> steady snow in the front range will transition into the midwest. >> reporter: in minnesota, snow has already started falling, more than a foot forecast for rochester and into green bay, wisconsin. this first week of spring proving winter isn't done with us yet. blake mccoy, nbc news, chicago. >>> when we come back, remembering a legendary baseball player and broadcaster, and longtime member of the nbc family. ===terrvo= the legatns heorcedclasates exe in

we get more from nbc's blake mccoy. >> reporter: after the movie "concussion" -- >> i found a disease that no one has ever seen. years of reports questioning football safety, now for the first time publicly, the nfl admitted on capitol hill a link between football and the degenerative brain disorder cte. >> mr. miller, do you think there is a link between football and degenerative brain disorders like cte? >> well, certainly dr. mchugh's research shows that a number of retired nfl players are diagnosed with cte, so the answer to that question is certainly yes, but there's also a number of questions that come with that. >> reporter: the add nigs backs up what families of players like junior seau and frank gifford have already known. talk radio is abuzz. >> there had never been that clarity, that decisive admission of the connection between football and cte. >> the implications could be big. already lawyers appealing a billion-dollar class action lawsuit with thousands of former players say the nfl's admission means the settlement isn't researchers think this could be a turning point. >

blake mccoy, nbc news. >> late word that sports reporter erin andrews is on the stand tonight in her $75 million civil trial. earlier in the day the man convicted of stalking andrews testified. he told the court how he altered the peep hole on andrews' hotel door and secretly filmed her. now as nbc's morgan radford reports, it's andrews' turn. >> reporter: erin andrews still haunted by the video that she says has damaged her career. >> i feel so embarrassed and i'm so ashamed. >> reporter: her chance to look jurors, seven women and five men in the eye and tell her side of the story. >> my naked body was on the front page of "the new york post" and they put bars over my body parts. my girlfriend is calling me and telling me she was running around new york city throwing coffee on all the pains because she felt so bad. >> reporter: just hours earlier andrews left the courtroom as her stalker explained the sordid details of recorded her. >> i could hear the shower on in her room and i walked by. >> reporter: and michael barrett explained how he followed andrews to her nashville hotel roo

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blake mccoy, nbc news, chicago. >>> and still ahead here tonight, a growing epidemic that kills dozens every day. the unprecedented action the cdc is taking to combat a danger that americans too often find themselves spiraling into. >>> also, heads of state. fascinating story behind this surreal gath i know how it is. you're all set to book a flight using your airline credit card miles. and surprise! those seats sometimes cost a ridiculous number of miles, making it really hard to book the flight you want. luckily, there's a better way... with the capital one venture card. with venture, you'll earn unlimited double miles on every purchase, every day. just book the flight you want, on any airline, then use your miles to cover the cost. now you're getting somewhere. what's in your wallet? what backache? what sore wrist? what headache? advil makes pain a distant memory. nothing works faster stronger or longer what pain? advil. ibs-d. you know the symptoms when they start. abdominal pain. diarrhea. xifaxan can help. prescription xifaxan is a 2-week treatment that can provide you with 6 to

football will miss peyton manning. >> omaha. >> reporter: blake mccoy, nbc news, denver. >> that will do it for us on a monday night. i'm lester holt. for all of us at nbc news. thank you for watching and good night. steve: today is your lucky y. wo man: (surprised) oh, my goodness woman: that's amazing! that's amazing! (shrieks) woman: ok, nice job. mark, way better than yesterday. maria, that delivery felt a little forced. and steve, steve: yeah? woman: i am still missing that raw emotion. woman: pretty awesome for a tuesday, but tomorrow is hump day, so let's really bring it! lucky for life. win a thousand dollars a day, every day, for life. this is "jeopardy!" please welcome today's contestants -- a board game designer from pittsburgh, pennsylvania... an educational researcher from raleigh, north carolina... an artist from decatur, georgia... whose 1-day cash winnings total... and now here is the host of "jeopardy!" -- alex trebek! thanks, johnny. thank you, ladies and gentlemen. hi. good to have you with us as we start another week with answers and questions on "jeopardy!" and na