on our broadcast tonight, moment of crisis. chilling new video from inside the washington navy yard, showing the gunman stalking the hallways, as investigators say they now have cracked the code in a message he left behind. up all night. a republican's effort to block the new health care law, talking for 2 hours without a break. but ready or not, the health care law's almost here. driven to distraction. the new vehicle on the road specifically designed to catch you while driving while distracted. and prime time for michael j. fox. this time his karker draws from his real life these days.

from nbc news world headquarters, this is nbc nightly news with brian williams. tonight the fbi has released the video that was recorded inside the washington navy yard complex showing the gunman going about his attack. we've also learned more about the includes he left behind that speak to the depth of his mental illness at the time. the victims' loved ones have already seen the video you're about to see. it shows hick stalking the hallways before the hail of gunfire that resulted in 13 victims, including the gunman. our correspondent starts us off. >> reporter: good evening. investigators say aaron alexis believed he was being tormented by a form of radio waves once used by the navy. cameras inside the navy yard building show aaron alexis carrying the sawed-off shotgun

that he used to shoot most of his victims. >> mr. alexis was a mentally unstable individual, and he was able to obtain a firearm two days before he carried out attacks that was planned to kill as many innocent civilians as possible. >> reporter: pictures released today show alexis arriving at the navy yard at 7:53 in the morning. driving his rental car into a parking deck. he walks into building 197, wearing a striped shirt and backpack. a short time later, he emerges from the restroom carrying the gun low. another camera catches him coming down a stairway with the shotgun. he fired at victims on at least three floors of the bidding. the last video shows him in another hallway, hiding at one point behind a corner as people rush away. he was killed at 9:25. he had scratched into the gun,

end of the tor meant, not what you y'all think and my elf. >> he believed he was being tor meanted by elf magnetic waves. >> reporter: the navy used that to commune kwat submarines but shut the program down years ago. alexis' backpack turned up something he wrote. ultra lee frequency attack is what i've been subjected to for the last months and that is what has driven me to this. there's no evidence that he called or e-mailed anyone to warn of the attack, and they found no evidence that any workplace dispute set him off. >> thanks. and now to politics in washington and the man who was up all night. the republican senator from

texas on a one-man mission to stop president obama's new health care law. critics have called him crazy, irresponsible and dangerous. others find him courageous for staying on his feet for 21 hours to get americans focused on what's about to happen to their health care. more on that side in a moment, but first, kelly o'donnell has more on the marathon on the floor of the u.s. senate. >> reporter: with texas size ambition. >> i intend to speak in support of defunding obamacare until i am no longer able to stand. >> reporter: 42 year old ted cruz in the senate just eight months, held up all of congress's work to make his point. >> the frustration that the united states senate doesn't listen to the people is deafening. >> reporter: he stayed on his feet for 21 hours, 19 minutes. stopped only by senate rules. did you accomplish something

here? >> i hope that this filibuster gave the american people an opportunity to express their views and to engage in this debate. >> reporter: the harvard trained lawyer and tea party firebrand who repeatedly bucked the establishment ignored gop leaders who preferred to fight obamacare in the house. >> most americans could not give a flying flip about a bunch of politicians in washington. >> reporter: he read from dr. seuss. >> i would not eat green eggs and ham. >> reporter: but many republican colleagues aren't amused. >> he's become a figure standing alone, talking a lot but doesn't have many friends. >> reporter: he provoked a backlash with this comparison. >> you go to the 1940s, nazi germany. >> reporter: cruz claimed those who don't join his fight are appeasers. >> they would have been saying you cannot defeat the germans. >> reporter: mccain says that went too far.

>> i resoundingly reject that allegation. >> reporter: cruz fires up the base but upsets some republicans who worry that his personal aspirations could risk damage to the republican party brand. while this was a one man protest and not a filibuster, let's put that aside as the theater aspect of this and now to the reality. nearby everybody in this country's going to be required to have health insurance next year. a first look at what the insurance might cost for those who buy it through one of the exchanges. and tonight we are looking at all the numbers. >> reporter: it's an all-out push to get the word out. the obama health care law is real and about to kick in. the government now running a contest seeking creative advertising to convince young people to buy insurance, because they're critical to the program's success. beginning october 1st, anyone who doesn't have insurance can

sign up through an online marketplace called an exchange. >> starting on tuesday, they'll be able to go to one place where they can't be denied coverage. their premium can't be jacked up because they have a pre-exists condition. >> reporter: today the first white house figures on what it might cost. the federal government's marketplace would offer four levels of coverage. bronze, silver, gold and platinum, each with varying deductibles and co-pays. on the silver plan, a single 27 year old earning $25,000 a year could expect to pay $145 a month after tax credits. a family of four earning $50,000 could pay $282 after tax credits. >> they may come with a lower premium but a much higher deductible as well. so people will have to make those tradeoffs. >> reporter: but the more you earn the more you pay. no tax credits for those earning

$46,000 a year. the total charm would depend on the insurance competition. in your state. a woman in dallas could pay $575 a month for silver coverage. but that same person living in indianapolis could pay $775 a month. coverage may still be too expensive. but starting next week, the uninsured can get insurance and will be required to keep it or pay a penalty. >> for more on this we're joined by dr. nancy sneiderman. we do have people who understand this. and we want to be a source of clarity. >> it has been controversial, complicated. that's. >> we wanted to kick off things here tonight. we know it's confusing. that's why we're starting a platform to clarify just what the affordable care act is all about. so i asked you to feel free to

send your questions to us. and we'll have the links on our website. and we're going to give you resources to help you figure out what that insurance will cost you. it is going to vary from state to state. and finally, it's important to remember, if you already have insurance or medicare, you are considered covered. and you don't have to worry about this new insurance unless you want to look for other alternatives. so this program is for people who don't currently have insurance or for people who are buying insurance on their own such as those who are self-employed. kicking it off, we're going to have a lot more in the following days. >> okay, nancy, thank you as always. now to the ongoing story out of nairobi. the massacre at the shopping mall. tonight there is dramatic new video as well from inside that complex, including a parking structure, three floors collapsed during the assault,

incredible devastation there. and with the bloodshed over, the work now begins to piece together what went on there and how members of this al shabaab terror group planned and executed their attack. nbc's ron allen has our report again tonight from kenya. >> reporter: kenya is in mourning. family members come to the nairobi morgue to identify the bodies of loved ones. as kenya's growing investigation into the mall attack gets help from around the world. >> the u.s., britain, germany, canada and other agencies including interpoll. >> reporter: the february was on the ground shortly after the attack began and now has a significant presence here. how did the al shabaab terrorists pull off the attack? they stashed weapons inside the mall in advance of the attack and had inside help. they rehearsed the attack using

blue prints of the mall and getting into kenya by paying off corrupt border guards. new video shows the extent of the damage. deputy commander who led a hostage rescue team said they rigged the mall with ieds. he says the assault was so fierce there was no time to talk. it was one of his men who saved a terrified mother and her children who had played dead until help came. kenyan forces saved hundreds, he told us. >> it could have been a lot worse. but if's a successful operation. >> yeah it's successful. >> reporter: among the survivors, ryan and amanda colby in africa for a safari vacation. now safely back home in texas. they say apart from the attack they have good memories. >> kenya's amazing. our whole trip up until then was

the highlight of our lives. >> reporter: they are looking for bodies in the rubble. as kenya grieves. also on the foreign news front. more surprising words from iran's president rowhani. last week you'll recall he distanced himself from his predecessor ahmadinejad. he claimed for years that the holocaust was a myth. today in an off-camera interview with journalists, he went further than that saying quote, saying the massacre by the nazis was committed against christian, ju, against all of humanity. they carried out a massacre that cannot be denied. especially against the jewish people. still ahead for us, having the ability to handle all of

your electronic business while at the wheel of the vehicle. a ton of new technology raises a ton of new concerns about safety on the road.

this week, the state of new york joined other places in establishing so called texting zones where you can pull over at rest stops to use your electronic device. they've already put specially fitted suvs on the road that you will start seeing if you drive through these parts. they're designed to look into your car from up high and catch you drives distracted. but what if the distraction is built into your car? we get the story tonight from our reporter. >> reporter: in a new unmarked suv, high above other motorists, this state trooper is on the hunt for distracted drivers. five points off her license. that and up to $150 fine for talking on her phone.

which is illegal in 12 states. texting is banned in 41. think 23% of car accident involve cell phones, they're hardly the only thing distracting drivers. the dashboard looks like your computer. >> it's really a one stop shop for your digital life behind the wheel. >> reporter: she says this technology allows car companies to stay competitive. >> are you encouraging, though, using facebook, google, and testing by incorporates it into the car? >> we're encouraging customer does look to the larger screens. but you're still glancing down as you would for a radio station. >> reporter: many new cars come with new connectbility and touch screens allows you to axis the

internet. the government reported 26,000 crashes involving somebody adjusting controls in the car. now watchdogs worry that number will only get bigger. >> you want want the pilot of your plain checking facebook. you wouldn't want the doctor checks facebook. you don't want to do that while you're driving. >> you can say the same thing for someone walking down the street who's texting on their smartphone. >> reporter: but i'm not driving a car when i'm walking down the street. >> that's true, but you shouldn't be doing it. you shouldn't be driving down the road typing on your smartphone. >> reporter: that's why she argues they've put the technology into the dashboard. >> there is still some level of distraction, but it is safer than using a smartphone. >> reporter: the caveat, nissan limb lim limits what you can see. >> this is an improvement. we think there are more

improvements in the fee future and we'll continue to roll those out. >> reporter: next up, by 2020, a car that drives itself. impossible, they hope, to distract. irvine, california. and we're back in a moment with what's being called one of the great comebacks ever and it happened on the water.

the comeback of 2013 is complete! >> in the rarefied world of yachting enthusiasts and those who like to watch boats go really fast, the epic america's cup is over. oracle team usa staged a comeback. they came back to win the ser s series 9-8. the cost of mailing a letter could go up to 49 cents next year. a new proposal to raise billions

of dollar does pay for retirement benefits for postal workers. the death toll following a major earthquake in pakistan has reached 330. that's an estimate. the scope of this quake can be seen another way. there is a new island in the word, formed in the indian ocean. it rose up out of the seabed. people were already out on it and walking on it today. amazon has unveiled its new line of kindle readers. amazon's latest thing is the mayday button. you press it on the screen, and you get a live screen with a customer service representative to help. the ceo has been in the news for buying the washington po. he says it's because he believes in good quality journalism. skbri don't know anything about the news business. so the way i'm going to help

them is maybe with a cup of solution ar sort of advice about technology and the internet. we put the reader first. if we take our time and our patience, and if we experiment and really innovate, we'll find something that can bring in a new golden age of journalism. >> he also said he predicts printed newspapers will some day become a luxury preseinted item. when we come back, don't call it a comeback. it's an extraordinary turn in the career of michael j fox.

finally tonight, michael j. fox is back on this network where he became a star. this time around he plays a guy returning to work while living with parkinsons. he sat down with our reporter to talk about his return to prime time after a decade and how i feels about being a ens prags to a lot of people. >> reporter: he burst onto our tv sets in the '80s as alex p keaton in family ties. then rode a time traveling

delorean as marty mcfly in back to the future. now 22 years after his parkinson's diagnosis, michael j. fox is making a full time return to television in the nbc comedy, the michael j. fox show. he plays mike henry, a family man and tv anchor returning to work five years after parkinsons put his career on hold. you got your diagnosis when you were 30 years old. young onset parkinsons. you were flying high. that must have flattened you when you got that news. >> it came with a prognosis that i'd have maybe ten years left to work. that's what was said to me. i was just married. my son was just born. my father had just passed away. >> reporter: but he picked himself up and became the defy

ant face of parkinson, giving strength to the 1 million americans living with the disease, my own father among them. i'm on the board of the michael j. fox foundation. i think the greatest compliment i can pay is when my father was decides why to go public with it i could point to you and say look what he's done with it. do you have a sense of the way you've inspired people? >> i don't look at myself as a leader. i'm a visible member of the community. if i can set that example and make them feel thaw don't have to shut it down. you don't have to withdraw. it didn't have to be life shattering or life ending or life destroying or any, just be a new thing that ush ps you to a new place. and so like one of the things about doing this show, like why not? why can't i? why can't i? >> michael j. fox and willie

geist take us off the air this night. thank you for being with us. and we hope to see you right back here tomorrow evening. good night. we're down to one race for the america's cup. >> months of controversy, a cheating scandal and millions of dollars, but this evening a grand celebration. many of us are familiar with the dramatic story line.

and the man behind it all,ellis. >> and then there was a crowd. huge crowd. 25,000 along the bay to watch the final moments oof the race. we have team coverage. we were there for all the excitement. but we begin with lawrence who's been covering the race since last summer. you've been on the boat. oracle team usa defending again. they celebrated this. it's a real celebration not just in the bay area. sailing fan