15 million followers, many of them children. Tonight the backlash. Californias new gold rush, inside the Worlds Largest market for legal recreational pot. Announcer this is nbc nightly news with lester holt. Good evening and happy new year. Great to be back with you. Millions of americans made the post holiday track back to work and schools today in the teeth of an arctic blast that has left at least 15 people dead. Triggered wind chill and deep freeze warnings from the deep south, state of emergency in georgia, to new england. Perilous travel, left firefighters battling fire and ice, turned Niagara Falls into a chilling still life. For some, the worst is still to come. Blake mccoy with the latest. Oh, my god. Someone just ran off the road. Reporter tonight 19 degre a massive pileup is snarling interstate 90, a foreboding look at whats to come with a major snowstorm set to move up the east coast. Wow. Look at that truck. Reporter much of the country already sits under a brutal deep freeze. Contributing to at least 15 deaths. In chicago, fourth day in a row below zero temperatures. Its just cold. No way around it. I dont think you can really prepare. Reporter more than half the u. S. Population, 200 million americans, saw temperatures below freezing today. From the north at Niagara Falls, down south to savannah. 23 people hurt in bronx, new york, including a firefighter as they battled elements, fire and ice. Hoses and ladders frozen. Frozen pipes a common site in midwest. Illinois house caught fire when homeowner tried to thaw pipes with blow torch. I wouldnt recommend that. For a homeowner, trying a torch. This is professional use only. Reporter check out close call near dallas, a Police Officer slipped and fell on icy highway as car nearly slid into him. Not all bad, crisp air ideal viewing for tonights super moon. Ice fishermen happily dropping their lines. But amber martin isnt looking for silver linings. Cant tell you how many inches of ice on it. Reporter shes looking for way out. Speaking of, travel going to be even more difficult starting tomorrow with snowstorm developing off east coast. Drivers and fliers will be impacted. Some airlines already offering waivers. Lester. Blake mccoy, thanks. Turn to al roker who is here and tracking the storm. Moderation of temperatures t raleigh, detroit. All with temperatures well below freezing and zero. Winter weather advisories for 22 million people. Florida. First time this time of year weve had winter storm warnings in four years. Wintry mix up into the midatlantic states. Norfolk going to see problems. Morning rush in northeast, philadelphia, new york, boston to bangor, heavy snow, strong winds, blizzardlike conditions possible for boston. Snowfall up the coast, talking upwards of 8 to 12 inches. And moves further west could be heavy snow in new york, philly, down to washington. Bears watching. Al roker, thanks very much. Now to major developments in two hot spots around the globe. In iran at least 20 People Killed in clashes between antigovernment protesters and security forces. [000 04 58;00] take up kim jonguns surprise offer for new talks weeks ahead of the winter olympics. Weve got it all covered from both flashpoints tonight, beginning with latest on widespread protests in iran. Chief Foreign Affairs correspondent andrea mitchell. Reporter protests rarely seen in iran. Cars burning, buildings in flames. Poster of the allpowerful Supreme Leader is trampled. Chants of death to the dictator. Khomeini blaming the u. S. , saying the enemy is waiting for opportunity for a crack through which it can infiltrate. A claim strongly rejected by administration. We know thats nonsense. The demonstrations are completely spontaneous. Reporter unlike disputed elections in 2009, this is sparked by frustration over a weak economy. Spreading nationwide. President trump supporting the protests, tweeting people of iran are finally acting against brutal and corrupt iranian regime, u. S. Is watching. Tweeting time for change. Is he calling for regime change . President is talking about exactly what the iranian people are saying. They want change, the government to take care of them. Reporter could the tweets backfire . Sparking a crackdown . We could give the regime excuse to come down very hard on them. Reporter u. S. Caught off guard by protests but now encouraging them. Andrea mitchell, nbc news at state department. Reporter im Kelly Cobiella in seoul. Tonight u. S. Military sources tell nbc news kim jongun might be about to test another ballistic missile. What would be a dramatic move after surprising call for talks with south korea saying he wants to ease tensions. South korean officials suggesting a meeting most dangerous border on earth, demilitarized zone. In buildings known as truce village where guards stare each other down, not far from where a north korean soldier was shot in november during a desperate escape to south korea. Now talk about north koreas figure skaters gliding across the border for winter games with kim jonguns blessing. President trump weighing in. Sanctions and other measures beginning to have big impact. Rocket man wanting to talk to south korea for first time. Perhaps its good news, perhaps not. We will see. Kim jongun already claiming to have Nuclear Button on his desk, that his missiles like this one launched in november can reach all the way to east coast. Experts say still technical hurdles still to cross. I think we have a 10 chance of fullon war on the korean peninsula. Chance to resolve it diplomatically. Reporter wednesday morning in seoul and no response for from the north korean regime to that invitation from the south. Lester. Kelly koeb aia, thanks. Another tense global front, President Trump took to twitter to threaten cutting off aid to palestinians, acknowledging the stalled peace process, accusing palestinians of refusing to negotiate. Quote, why should we make massive future payments to them . After made the controversial decision to recognize jerusalem as israels capital and move the u. S. Embassy there. Investigators from the faa and ntsb arrived tonts in costa rica to help determine what caused small plane to slam into a mountain, killing a dozen people. Learning more about the victims, including ten about their loss. Gabe guttierez with stories. Reporter Amanda Geissler was fearless. 33 years old, prime of her life. Loved with all her heart. Would do anything for anything. Anyone. Reporter family is heartbroken. Had this light nobody else has. Reporter grew up in wisconsin, College Basketball standout. Loved adventure. Working as trip leader for travel Company Since may. That was the magic of this young she could do things and move people. Reporter she was among ten americans and two local crew members killed sunday when a single engine nature airplane slammed into a mountain in costa rica. Also gone in an instant, weiss family from near tampa, florida, and steinbergs in east family goes on vacation, dont come back. Reporter another crash today, Civil Aviation director said didnt believe indicated larger safety issue with the airline. But for Amanda Geisslers mother amanda, i was so proud of you. To be your mom. I love you to death. Reporter its not why that matters, its who was lost. Gabe guttierez, nbc news. In other news, a new gold rush of sorts kicked off in california, now that sale of Recreational Marijuana has become legal with the new year. Hundreds of new businesses cropping up and looking to cash in. Jacob soboroff takes us inside the new pot bonanza. Reporter day one of sales, at madmen, theyre hoping that lines multiple city blocks long help them cash in on projected 5 billion of legal pot sales. Why do you come here . Versus another ever been in. It is like an apple store. Reporter expecting to quadruple. Lured in like this. Dr. Js lateral oz. Whatever that means. In seoul even as valley, been refurnishing greenhouses to grow cannabis. Lots of it. Youve been waiting for this a long time. Working and struggling towards this moment entire adult life. Reporter hopes taking page from modern agriculture and producing pot on massive scale become a brand name in weed. To me this almost looks like you could be growing anything found in supermarket. Can grow in greenhouses what is equal in quality and less expensive. Than the cannabis grown in warehouses. Reporter dispensaries. This is almost like ground zero, how many more are you going to open . Expect a statewide footprint within three years and hope to take this model out to the rest of the world. Reporter in a country where marijuana is still federally illegal, not everyone is happy. Nobody ever is in a gold rush, and this one is officially under way. Jacob soboroff, nbc news. Los angeles. Widow of colorado deputy killed in new years eve ambush is honoring memory and opening up about the tragedy. Learning new details about the gunman and disturbing video trail he left behind. We get the latest from nbcs steve patterson. Reporter widow of slain Deputy Zackari parrish held her daughters close as spoke to packed memorial. I will do everything in my ability to honor you. Reporter one of the girls whispering to mom its okay. Allegedly killed by matthew riehl. Firing more than 100 rounds, wounding four more deputies and two bystanders. Bullets flew across the courtyard into apartment, one striking his arm. I thought its all over. And with gods blessing im still alive. Not here to hurt anybody but i do have firearms. Reporter chilling new video obtained by gep hrt daily. Com and nbc usa shows him recording himself rambling, drinking, calling 911, saying he had been victim of domestic assault. But deputies arrive, he becomes agitated, barricades himself, takes aim. Leave me alone, go, get out. [ gun shots ] reporter you can see how riddled the shooters Apartment Unit is. One window busted out. Other draped in flag with skull and two assault rifles. Veteran and lawyer with no criminal record, motive is mystery. For this family, grief is all too clear. Girls to love you. Reporter steve patterson, nbc news, littleton, colorado. This new year also off to tragic start for the u. S. Military. Service member was killed in combat engagement in afghanistan, four others injured near the border with pakistan, an area thats become a stronghold for isis. Name of the slain american is being withheld pending notification of the family. Still ahead, what are your children watching online . Youtube star facing backlash. Sharing something horrific with millions of followers, many of them young kids. Also those who serve, women making sure Fallen Heroes never make their final journey alone. Hope you can stay with us. You want your denture to be stain free. Did you know theres a specialty cleanser thats gentle enough for everyday use and cleans better than regular toothpaste . Try polident cleanser. It has a four in one cleaning system that kills ten times more odor causing bacteria helps remove tough stains, and maintains the original color of your dentures when used daily. For a cleaner, fresher, brighter denture, use polident every day. My shoulders carry more they carry my communitys pride my familys pride and pride in myself because shoulders were made for greatness not dandruff for my constipation, i switch to miralax. Stimulant laxatives forcefully stimulate the nerves in your colon. Miralax is different. 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Reporter with more than 15 million followers, mostly millennials and younger, youtube star logan paul is known for making daily video blogs that detail his life. Lets jump out of a plane and hopefully not die. Reporter often funny and high energy. But latest video is a low key apology. Ive made a severe and continuous lapse in my judgement. Reporter facing backlash for video of him and friends walking through japanese forest, place known as destination for suicides. Do you think thats real . Reporter video viewed by millions before deleted showed a body hanging, an apparent suicide victim. I should have never posted the videos, put the cameras down. Reporter forbes ranked him, fourth on list of highest paid youtube stars, saying he made 12. 5 million in a year. Stars are looking to push the envelope. Because so much competition for ad money and clicks, going out of their way to shock the viewer. Reporter in written apology paul said i didnt do it for views, i get views, i did it to make a positive ripple on the internet. Never stand next to a dead guy . Reporter but Mental Health experts say showing a dead body doesnt raise awareness about suicide. Somebody sees a negative harmful image, can impact the distress theyre already feeling. Reporter youtube said this video violated policies. In wake of Suicide Prevention group so people realize they can reach out for help. Joe fryer, nbc news. Taking a short break. When we come back, do you have lotto fever . Still time to get tickets for two massive jackpots. Have lott . Still time to get for 100 years, heritage and innovation have made gillette the 1 shave in america. Now get gillette quality at lower prices every day. Brought to you by 1200 workers in boston were proud of giving you our best. Gillette. The best a man can get. We cut the price of trades to give investors even more value. 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In low prices find the right hotel for you at the lowest price. Finally tonight, let me share with you a story about a special group of women who stand for those who stood for us. Known as arlington ladies, comforting figures at virtually every funeral at Arlington National cemetery, each representing a branch of the military. Honoring those who served. Most dont recognize their names but recognize duty and sacrifice. Wanted to celebrate with you his great spirit and his love for his family. If only for hour, an Arlington Lady is family. And sometimes like this one, only family present when American Patriot is laid to rest here. Paying respect, honor, dignity. Attended hundreds of burials, stood with hundreds of families, starting with air force in 1938. Today part of virtually every arlington funeral. After the flag is presented, move forward to the next of kin, usually a spouse. Present the card from chief of staff and personal note from the arlington ladies. All of them have personal connections to the military. They are not professional mourners. Quite the opposite. And i am presenting to them any comfort i possibly can. And they have two extra ears, two shoulders to lean on, two hands to hold at one of the most [000 27 59;00] their life. They have to balance emotions with being a comforting presence. That is the hardest thing, the emotion. Its difficult. Its difficult. Too difficult for some volunteers. Theyve literally selfeliminate. When they break down and they hear the rifle volleys. [ gun shot ] thats one of the toughest things. You hear the rifle volley and taps. This gentlemen is from world war i. The funerals a time line of americas wars. Just about through with Second World War now, then theres korea. And were into korea. No matter when or how they served, they can know this idea here is no one is buried alone. Thats exactly right. Forgotten. Appreciate you spending part of your evening with us as we begin a new year. Thats nightly news for this tuesday night, im lester holt, for all of us here at nbc news, thanks for watching and good we like to be this close. Is there a problem . History made this morning on today. Only access is uncovering the surprising secrets behind this dynamic duo. Yes