With three shows left we hear more from David Letterman and look at the shifting landscape of late night tv. We begin with your world in 90 seconds. Newew video shows the moment the amtrak train flew off the tracks. Did something hit the amtrak train before the deadly derailment in philadelphia . This apparently was not the only train to get hit that night. They had been hit by rocks or shot at. The jury has spoken. Dzhokhar tsarnaev will pay for his life for this crime. He is going to go to hell. Nobody is really a winner today. Islamic state militants wage a fierce battle in iraq raising their black flag over the main government compound. Huge area of Severe Weather. The entire plains the threat will be tornadoes and damaging winds and large hail. Keep an eye to the sky. One of the most iconic retailers is closing. Mitt romney and Evander Holyfield enter the ring. Dont beat my brains out. That is a fire in one of the smoke stacks of the Great American ballpark. And all that matters. The atlanta uchawks win the game on cbs this morning saturday. People stop me on the street for selfies. Its annoying isnt it . I think we should. For old times sake. Im barely in it. You want it there. Come on. And welcome to the weekend. We have a great show for you this morning. We are going to take you to england where the future of the worlds chocolate may rest in this building. It is the cocoa Quarantine Center. Plus an empire of mexican and latin restaurants all began with a chance encounter that changed his life. Youll meet him. And performing in our saturdays session, work earned comparisons to marvin gaye. You will hear songs from the debut record later in the show. Dramatic developments in the investigation of that deadly amtrak derailment in philadelphia on tuesday. New Surveillance Video shows the train speeding down the tracks and leaving the rails in a shower of sparks as the National Transportation safety board tries to determine the cause of the crash. The fbi is launching its own investigation. That came after word that some kind of projectile or rock or possibly a bullet may have hit the windshield of the locomotive before it derailed killing eight passengers and injuring dozens of others. Two other trains in the area may have been struck as well. Chris van cleave is in philadelphia with the latest. Reporter good morning. These new developments mark a major turn in the investigation. When we first heard about the Regional Commuter service being struck we were told it was unrelated to the derailment. Now with the damage to derailed train and possibility of a second amtrak train being hit the ntsb is asking the fbi to take a closer look. New Security Camera video of the moment amtrak train 188 hit its tragic end the National Transportation safety board reported friday in addition to the engineer two assistant conducters have been interviewed, one revealing new information shortly after leaving the philadelphia train station she heard an engineer report his train being hit. The ntsb is also aware of reports of a washington bound amtrak train being struck by an object. Damage can be seen in this picture. Both incidents in the same general area. Our investigation is not independently confirmed this information but we have seen damage to the lefthand lower portion of the amtrak windshield that we have asked the fbi to come in and look at for us. Reporter while investigators say engineer Brandon Bostian has been cooperative he does not remember the incident. He is required to sound the bell as he goes past the station stop. He did that and recalled doing that. He has no recollection of anything past that. Friends say he has a life long love of trains and describe him as careful. He was very thoreoughthorough, always on time. He always had his highlighter highlighting speeds and restrictions. Reporter with the fbi looking at the damage in this Major New Development of the investigation its still unknown why the train accelerated from 70 to 106 Miles Per Hour heading into a sharp curve. Retired train engineer worked for amtrak for 36 years and says engineers are required to know the speed limit on the tracks at all times explaining that every 23 seconds engineers have to respond to an alarm designed to keep them alert. It is unusual for Something Like this to happen. There is a distraction. There is something that happened and the only person that knows what happened is that engineer. Reporter we have also learned that Philadelphia DistrictAttorneys Office is following the investigation and gathering information. It is too early to know if that will turn into a criminal investigation. Thank you. For more on the investigation into the amtrak train we turn to cbs news National Transportation safety expert former chairman of the National Transportation safety board. Good morning. Good morning. What do you make of the new developments that some kind of projectile hit the windshield and cracked it . It could be a very important element. Remember that accidents are never just one thing. They are a chain of events that come together. You take one link of the chain out and the accident wont happen. Clearly with the fbis entrance into the investigation we will get good information to understand what this was and how it might have gotten there. I want to ask you about positive train control basically something in the train would have taken a signal from the stations to determine how fast the train was going. If this is the busiest section of amtrak why didnt this have the control . It was being prepared for it. It may have had it in the coming weeks. They and mr. Bordman has committed to having that completed as required by congressional mandate. That mandate came down in 2008. It was all the tracks in the country were supposed to be done by now. Why havent they been . Its a very expensive proposition. Even with that said i was the chairman at the time and we were very, very excited about the proposition that in seven years and it seems like a long time and did to me when i was sitting there at the board, we thought this was going to actually be completed, but because it is such a very expensive proposition and there are so many miles, 62,000 miles of track in the United States it took longer than the railroads anticipated and than we anticipated. We want to draw on your expertise and ask what are they asking him . He was interviewed yesterday. Remember we are not a criminal investigative body. We are a safety investigative body. We want to find out what the truth is. Remember from our point of view that is all we are looking for. We are not pointing fingers. We are not trying to find blame. We are trying to find the truth so we can understand exactly what happened and prevent it from happening again with the recommendations we are going to make. Thanks for being with us this now to the death sentence for the Boston Marathon bomber. The federal jury that convicted Dzhokhar Tsarnaev in the 2013 attack that killed four people and injured more than 260 spent 14 hours deliberating his fate. They announced their unanimous decision friday afternoon. And the u. S. Attorney put it quote, hell pay for his crimes with his life. Don has been covering this trial and is joining us from boston. Good morning don. Reporter good morning. Over the past ten weeks of trial, the guilty verdict might have been a foregone conclusion but this result was anything but. This area is traditionally opposed to the Death Penalty, but in the end his attorneys words were not enough to outweigh Dzhokhar Tsarnaevs own actions. For two years boston has been a city holding its collective breath for this. I think that its justice. Reporter but inside Dzhokhar Tsarnaev showed little emotion standing with head bowed as his fate was announced. First responders victims and family members were relieved. This is nothing to celebrate. This is a matter of justice. Hes going to go to hell. Thats where he wanted to go but hes going to get there quicker than he thought. As a father i put myself in Bill Richards shoes at that time. I think all of us feel that way. If you have children you understand how important it is to protect children and to be there for children. Reporter federal prosecutors knew they had an uphill battle in massachusetts, a state that outlawed the Death Penalty in its own cases. Its likely this is the critical image of the injury, ptsarnaev is putting a bomb near this family. He denies his involvement in the bomb that kill eded Bill Richards. Thats the strong message we sent today. Reporter the defense centered on the argument it was the older brother tamerlan who made the younger brother get involved. If nobody can see into another persons mind our job was to try to recognize the facts and the evidence that would help the jury make that decision for themselves. Reporter the defense team admitted tsarnaevs guilty from the beginning but pleaded for mercy. Ultimately neither that nor his youth nor tales of his disfunctional youth swayed the jury. But what did sway the death was the deaths, the injuries the way dzhokhar and his brother committed these crimes. Sentencing will come over the next two months at which time hell be transferred to death row in terre haute, indiana, and his attorneys will launch a lengthy appeals process. Tom thank you. Well take a closer look at how this shook out in the court and what could be next for tsarnaev. Here is our cbs legal analyst, good morning ricky. Well start off with where don left off. How big of a role do you think this is unanimously this kid showed no remorse. How does that affect the outcome . That was the critical factor in this case. You have to understand that the only remorse that Dzhokhar Tsarnaev showed was for himself. He was stoic and had no emotion. When did he cry . When his aunt came in to talk about his childhood. The only person that he felt badly about, the jurors could find, was him and not about any of these victims. When you listen and you look at the carnage, at the horror of his act, these jurors went into a war zone. There was no First Responder who attended to every victim who went to every part of that bombing, who saw every body being pulled apart. These jurors went through each act. And this defendant looked straight ahead. The cornerstone or one of the cornerstones of the defense was that he was ultimately influenced by his older brother. That he wouldnt have done this without that influence. Did the jury basically reject that . Well, three of the jurors did not. Three of the jurors go along with the mitigating factors, having to do with tamerlan the older brother, really being in charge of and over Dzhokhar Tsarnaev. And all the defense needed was one of the three. However, those three finding that his older brother was the cause, without Tamerlan Dzhokhar would not have been a jihadist, even they had to say the horror of the act, the carnage, the war zone had to outweigh why he became a jihadist. And the other factor is the terrorism expert said this anyone can become radicalized. It doesnt matter by whom. They still are responsible for their own actions. Fascinating. A lot of appeals coming up. Thank you for being with us this morning. Coming up later here one of the most important eyewitnesss in the tsarnaev case never took the stand. Well tell you how one photographers work helped convince the jury to vote for the Death Penalty. And the bodies of all eight people aboard the u. S. Marines helicopter that crashed in nepal were recovered. They were on a Relief Mission for earthquake victims. Seth doane is joining us with the latest. Good morning. Reporter good morning. The investigators called the crash site severe. They had not yet positively identified all of the victims and had not yet determined the cause of the crash. That missing huey helicopter was ultimately found after three days of searching high up in the mountains. It was located at an altitude of 11,200 feet roughly halfway between kathmandu and mt. Everest. The six u. S. Marines on board along with two nepalese soldiers were delivering aid to remote regions tuesday night, specifically delivering tarps and rice to hardhit areas after this earthquake. But their helicopter did not return from that mission. Its part of a wider humanitarian aid mission that involves about 300 u. S. Troops who are currently in nepal. Landslides have been a huge issue cutting off roads and that means cutting off aid. So the helicopters are a real lifeline, sometimes the only way to get aid in and to get those who were hurt in the disaster out. On friday president obama offered his condolences to the families who, anthony, are grappling with this terrible news. Seth doane in beijing. Thank you. Sources are getting closer to the ancient city of palmyra. That is one of the most magnificent archaeological sites. There are fears that isis will destroy the site as it has with other ancient ruins. In iraq Islamic Forces hold a large part of the city of ramadi. This is a major setback for the Iraqi Government and they are sending reinforcements in an attempt to regain control of ramadi. Violent storms threaten a third of the nation today from texas all the way to minnesota. Severe storms moved through parts of nebraska on friday with thunder and lightning and dark threatening clouds large hail fell in the area. 100 miles away a tornado touched down with no injuries or major damage reports. For more well get to meteorologist ed kern of our chicago station. Good morning. Good morning, bonita. We are looking at active weather throughout the country here. We have the potential for Severe Weather but the greatest potential lies here in the orange and red area for enhanced and also a moderate chance of severe storms. Now, within this region from nebraska to kansas to oklahoma we have a chance for significant severe. That means strong tornadoes of ef2 or greater and tornadoes that have a long life and also large, destructive hail of twoplus inches. And that region is from wichita falls, texas all the way up to southern nebraska. Bonita . Meteorologist ed curran thank you. In california intense rain caused some flooding but it is just a drop in the bucket for the droughtstricken state. From San Francisco to san diego, streets were flooded and cars and trucks went nowhere. Weather experts say californias climate may be starting to change and could become kepter in the next year. Also in california, a new law that took effect this year has made big changes for chickens. It requires farmers to house hens in cages with enough space to stretch their wings. The new standard is backed by Animal Rights advocates but there are worries about higher egg prices. John blackstone has more. Reporter in california these may be the best of times for chickens with a new state law requiring they have more room to move. Here in san diego, 8,000 are now living cagefree in frank hilakers barn. I like to call it disneyland for chickens. Reporter hilaker is scrambling to meet the new regulations, often at great extents. Business is not all its cracked up to be. Reporter egg prices in california doubled in 2014 but then quick to competitive business in which producers are reluctant to raise prices. So in a way the egg producers are playing chicken right now. I like that yeah. Reporter you told me theres no evidence that the chickens are really better off. By some criteria they are better off, by other criteria they are worse off. Reporter chickens can be more vulnerable to predators, those kept in big open barns may be more likely to get injured. Still, it has to be better than being crammed in a tiny cage. Some people look at apartments in San Francisco and new york city and say, how in the world can people live in those little cages . But i dont go there either. I dont know. Im not a chicken behaviorist. Their brains are about that big. Reporter what we do know is the chickens got a little. Im john blackstone, woodland, california. Time to show you some of this mornings headlines. The wall street journal reports that bill and Hillary Clinton earned more than 25 million from speaking engagements over the past 16 months. Financial disclosure forums submitted the federal Election Commission showed democratic president ial contender Hillary Clinton also earning 5 million from her book hard choices. Usa today reports starbucks has a warning for its customers who purchased items using their mobile phones. It says hackers can syphon money from mobile app accounts. Customers who were targeted wont be charged for the stolen goods. It is not just this company, i thought uber had a similar issue as well. The Los Angeles Times says google plans to send their fleet of selfdriving cars out to the roads. They will hit the streets of california sometime this summer. Other companies are taking note apple and uber are finetuning their own prototypes. A quarter million selfdriving vehicles may be sold every year by 2025. And the New York Times says fao schwartz on fifth avenue here in new york will close in two months. Its the victim of rising rents agrowing competition from online retailers. The store has been in business for that years and played a cameo in the 1988 movie big when Actor Tom Hanks danced on the giant keyboard. The owners are