Revealing now what was discovered hidden throughout the singers home. United airlines under fire again tonight. The couple flying to their wedding and their eyeopening claim. Good evening. Its great to be back with you after the holiday. We begin tonight with that urgent man hunt now going nationwide. The suspected killer who then posted his killing on facebook. Authorities said took this video. Walked up to an elderly man, a perfect stranger. There are more victims. Tonight, u. S. Marshals and the fbi are now joining the hunt. After foug focusing on a handful of states tonight, tonight the search is now nationwide. Abcs alex perez leads us off from cleveland. Reporter tonight the the man who took and posted this video to facebook. Police say it showed the senseless murder of an elderly man. He could be nearby or far away. Reporter authorities now offering a 50,000 reward for any information leading to the arrest of the suspect. Im going to kill this guy right here, the old dude. Reporter police were alerted to the shocking video, 37yearold Steve Stephens getting out of his car and walking over to an unsuspecting 74yearold Robert Godwin sr. Hes about to shoot him because of a woman. Hes the reason why all this happened to you. Reporter the next moments too graphic to show. One male shot. Reporter police racing to the scene of the murder, but the suspect was gone leaving behind a trail of recent chilling posts. Investigators said he lost everything to i lost everything i had. Reporter in another claiming to have killed more than a dozen people. I killed 13 people. Im about to keep killing until they found them. Reporter the urgent manhunt for the stephens temporary putting cleveland universities and hospitals on lockdown. Late sunday, words that his cell phone was pinged 100 miles away in e reshg officials revealing today, detectives spoke to stephens by phone shortly after the murder took place. They tried to of course to convince him to turn himself in. Reporter today, stephens place of work closed. He mentored foster kids at a Mental Health facility. Facebook disabling his account after reports of the murder video came in. But that up for more than two hours. The company saying in a statement, it was a horrific crime, one that has no place on facebook. We know we need to do better. Tonight the family of the man who stephens randomly killed calling for justice and trying to make sense of their loss. Were beyond shock. To somebody brutally murder my father like that, is unbelievable. Just horrible. Alex perez joins us tonight from cleveland. Alex, authorities this evening saying the suspect did not have a criminal record and were learning what they found when they searched his home. Reporter yeah, thats right, david. Authorities say they recovered weapons and other evidence important to the investigation. The suspects family and the woman mentioned in that chilling video are cooperating with police. The other major story tonight, the new threat from north korea. The escalating war of words. North korea now threatening missile tests every week. Vice president Mike Pence Visit the border, warning north korea and reminding them about the u. S. Strike in syria and the u. S. Bomb dropped in afghanistan a week later. Or correspondent asking President Trump, whats next. Abcs Martha Raddatz reporting from south korea tonight. Reporter tonight, a defiant north korea pledging to conduct missile tests on a weekly, monthly and yearly basis, accusing the white house of pushing the situation there to the brink of war. Thermonuclear war may break out at any moment on the peninsula. Reporter but now from President Trump a blunt warning. Any message for north korea . You got to behave. Reporter in pyongyang this weekend kim jong uns military might on full display, including what appeared to be a new longrange ballistic missile, canisters of green camo mounted on huge transporters, but amid that show of force, an embarrassing failure a botched missile test, the weapon exploding seconds after launch, and tonight, questions about whether it was cybersabotaged by the u. S. There is a very strong belief that the u. S. , through cyber methods, has been successful on several occasions in interrupting these sorts of tests and making them fail. Reporter tensions between the u. S. And north korea now at an alltime dangerous high. North korea is a problem. The problem will be taken care of. Reporter but just what that means, unclear. The era of strategic patience is over. Reporter in south korea Vice President pence visiting the dmz, delivering a warning of his own. Just in the past few the world witnessed the resolve and the strength of the United States. Currently stationed in south korea. We visited one key base just 48 miles from the border. Here, they are at the ready. Their slogan fight tonight. There arent many places i go into where it says fight tonight in giant letters. Absolutely. Reporter thats a little frightening. Absolutely. But for us its our daytoday training because we dont know when that call is going to come. Reporter as for the commander inchief, the white house says hes holding his cards close to the vest. I dont think that youre going to see the president drawing red lines in the sand. Reporter today when asked his next move, President Trump with just a twoword answer youll see. So lets get to our chief Global Affairs correspondent Martha Raddatz joining us. Martha, we heard the Vice President saying, the world witnessed the strength of our taken in syria and a week later in afghanistan. People wondering tonight, is north korea next . Reporter well, that is a message he wants north korea to hear but also china, the Vice President said he and President Trump have great confidence in china but if they dont pressure north korea in a meaningful way, the u. S. And its allies will. David. You heard the president today, make no mistake hes not revealing anything here. Hes not going to tell anybody what hes doing next, david. Martha raddatz reporting from south korea. I want to get to steven ganyard. First this new threat from north korea tonight, the threat to carry out weekly tests, could they pull this off. They test for two reasons to develop new missiles and they also want to stay on the stage. Once a week is not unreasonable. The world was watching, though, over the weeke possible nuclear tests, how real is that part of that threat . Its very real. They have been using satellite imagery to look at this mountainous region. They declared it primeded and ready to go. The next step is all up next to kim. He all right, colonel ganyard with us. Next tonight, the white house responding to protests across the country. Demanding that President Trump now that hes in white house release his tax returns. Just as president s have done for decades now. The protesters at those rallies say they are determined to keep up the fight. In the meantime, another first for the president , the traditional egg roll at the white house today. The white house was pressed are those taxes coming . And heres abcs chief White House Correspondent jonathan karl. Reporter President Trump today signing autographs at his First White House easter egg roll, mixing holiday tradition with tough talk. While standing next to the easter bunny. And we will be stronger and bigger and better as a nation than ever before. Were right on track. You see whats happening, and were right on track. Reporter but as the president publicly welcomed all those young egg rollers, his administration is facing heat, now for keeping private the names of people visiting the white house. Its a departure from the obama administration, which regularly released white house visitor logs with rare exception for reasons of national security. We maintain the same policy that every other administration did coming up here prior to the last one, and the last one frankly was a faux level of doing that because when you go through and you scrub everyones name out that you dont want everyone to know, that really is not an honest attempt at doing it. Reporter but critics say it defies the president s promise of transparency. They also point to trumps refusal to release his tax returns. Over the weekend, tax day protests popping up around the country. And at a town hall meeting today in little rock, republican senator tom cotton got an earful when he tried defend the president as far as im aware, the president says hes still under audit [ booing ] and he says hes going to release them when theyre done. [ booing ] its also reporter so, will his tax returns ever be released . You always talk about under audit, the president is under audit. Is it time to say the president is never going to release his tax returns . Well have to get back to you on that. Reporter you wont, i mean, really . Really. Reporter so he may . No, i said id have to get back to you on that. Hes still under audit. The statement still stands. Sean spicer says hell get back to you, jon. The white house and President Trump appeared not to be wavering on this the first sitting president in decades not to do so . Reporter the first president , david, since Richard Nixon not to release his taxes which means we know less about this president s sources of incomeses about his financial ties both in the United States and abroad. His charitable contributions and of course we know how much he actually pays in taxes. Jon, thanks as always. Were learning more tonight about that deadly military crash, a blauk hawk crashing down on to an American Golf course. The helicopter out of ft. Belvoir, virginia. Witnesses running to the scene there. Three crew members on board. One did not survive. Witness awitness reporting that the chopper may have hit trees as it was coming down. New revelations tonight from the investigation into the death of pop star prince. Newly unsealed records tonight show that he had hidden all throughout his home. As abcs eva pilgrim reports, one more glaring mystery. Reporter tonight, search warrants concerning music super star princes death unsealed, painting a picture of the singers opioid addiction. These Court Documents show investigators found a sizable amount of narcotic medications located inside paisley park. The pills, hidden in aspirin, and other overthecounter pain relief bottles, all over the house. Some of them, found in a suitcase along with handwritten lyrics to his 1987 hit u got the look were prescribed under the name of his long time friend and drummer kirk johnson, including the oxycodone prescribed by dr. Todd shulenberg after princes plane made that Emergency Landing in moline, illinois. Whats the nature of the emergency . Unresponsive passenger. Reporter johnson picked those drugs up from the pharmacy, but told investigators he didnt know prince was addicted, and it was the first time he had done Something Like that for prince. The search warrants now show investigators he put the prescription in johnsons name for princes privacy. David, whats still not clear is how prince got the powerful narcotic fentanyl that ultimately took his life. Investigators scoured his computer, email, and phone records looking for any clues, but found no prescriptions for fentanyl. David . Thank you, eva. Developing headline out of arkansas today. Place to hold the executions of eight men. They were scheduled to die over the next 11 days. Two separate courts have now put stays on those executions. The governor, though, still maintaining hes preparing for that first execution to take place tonight. Theres still much more ahead tonight United Airlines under fire tonight. Also the traffic nightmare unfolding in an american city. Theres news coming in tonight after that murder of a female jogger made national headlines. Accused about to make a court appearance. 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Reporter a week after this video forced a National Debate over passenger rights new tales of turbulence. They said it was not their problem. Reporter this utah couple on their way to their wedding in costa rica, claiming they were kicked off a united flight this weekend for sitting in the wrong seats. United says they were removed because they repeatedly tried to move to upgraded seats without paying extra. Even though we moved to the right seats, we were still taken off the plane. Reporter inflight disputes under the microscope as airlines roll out new rules. Delta authorizing supervisors to offer nearly 10,000 to volunteers giving up their seats for overbooked flights, and at united they will no longer ask seated passengers to give up seats for crew members. We have learned a lot, and we will do better, and thats what i promise. Reporter to avoid getting bumped your best bet is to skip late day flights, and remember to be decisive. Once you volunteer to give up that seat, you often cant change your mind. David, if youre in a position to take a later flight let the agent know as soon as you get to the gate. You can even name your price on the offer. Rebecca jarvis with us. Thank you. When we come back tonight the traffic nightmare in an american city. The interstate that suddenly buckled. The news tonight about that female jogger killed running near her mothers home. Ques. Are my teeth yellow . Have you tried the tissue test . The what . Tissue test hold this up to your teeth. Ugh yellow. I dont get it. I use whitening toothpaste. What do you use . Crest whitestrips you should try them whitening toothpaste only works on the surface. But crest whitestrips safely work below the enamel surface. To whiten 25x better than a leading whitening toothpaste you used the whitestrips i passed the tissue test. Oh yeah. Would you pass the tissue test . See for yourself with crest whitestrips. They are the way to whiten. 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He was working in the around dna evidence led to his arrest. Prince harry is revealing his personal battle, revealing in fact therapy three years ago. Struggling after the death of his mother princess diana. Prince harry said he was close to a complete emotional breakdown. I can safely say losing my mum at the age of 12 and shutting down all of my emotions for the last 20 years has had quite serious effect. Prince harry said his brother Prince William urged him to get counseling. When we come back here tonight america strong. Something we never knew about the Boston Marathon and why its suddenly back in the news tonight. If youve tried every pill on the shelf to treat your tough nasal allergies. Listen up. Unlike pills that dont treat congestion, clarispray covers 100 percent of your nasal allergy symptoms. Clarispray. From the makers of claritin. Peopleclean a denture. Ry old habits of using toothpaste to but dentures are very different to real teeth. 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