Good evening on this very busy friday night. We begin with an abc news investigation. The daughter who was kidnapped by isis, and her parents who now tell abc news that they made their own pleas to isis to release her. Kayla mueller was the Young American captured while trying to help the young victims of war. Her parents emailing isis from their kitchen in arizona. Tonight, never before seen video of mueller, she died in captivity. And her parents say the president made them a promise, a promise they say was not kept. Brian ross, leading us off. Reporter tonight, these home movies serve as a mother and fathers cherished memory of a young woman full of life. A daughter traveling the world to help the innocent victims of war. My name is Kayla Mueller. Reporter but that all ended with this video. Ive been here too long, and ive been very sick. Its very terrifying here. Reporter Kayla Mueller had been taken hostage by isis. And for the next 17 months, her parents, carl and marsha, would fight for her freedom. Sending their own video pleas to isis. Please show mercy and use your power to free our daughter. Reporter and exchanging some 27 emails from their kitchen in prescott, arizona, to her daughters captors in syria, who at one point set a 30day deadline for a 6 million cash demand. This kind of thing just tears people apart. Reporter kayla had been kidnapped in syria from a Doctors Without Borders vehicle, but in a phone call to the muellers, the organization refused to help get kayla back because they said she was not working for them. Would your staff negotiate for kayla . No. Reporter and after a failed u. S. Rescue mission, the muellers say a white house official threatened them and their friends with criminal prosecution if they tried to raise ransom money. Our government slammed that door. Reporter of kayla was killed, the president came to visit them. The muellers say he made a promise to help the foundation they set up in kaylas name, and then broke it. There hasnt been such a donation . No. Im still waiting for that donation, mr. President. Reporter today, our team pressing the white house for an answer. Reporter can the mueller family expect that the president , that the obamas will make a donation to their daughters foundation, the foundation in the name of Kayla Mueller soon . As i mentioned, i cant speak to any previous conversations that theyve had, but i can tell you that reporter but is a donation coming . The foundation, kaylas hands, thats been established in her memory is certainly the kind of foundation that the president and first lady have supported in the past and i would anticipate that they would make a financial contribution to continue supporting it. Reporter but none of that changes the muellers belief that the government failed their daughter. So we put all our faith in the government and they let us down. And they let us down. And brian ross is with us tonight. We know the u. S. Government does not pay ransoms. But there has been a change . Yes, now families of hostages are allowed to raise money themselves without the threat of prosecution. A direct result of what happened to Kayla Mueller and the other american hostages that were killed by isis. Brian will have much more this evening at 10 00 p. M. This evening on a special edition of 20 20. Well see you then. We move on to a major Security Breach at an american airport. A suspect jumping the fence and crashing a stolen pickup truck into a plane with terrified passengers aboard. Heres david kerley. Reporter the suspect restrained, still yelling. I started in front of omahas airport, a man yelling that someone was trying to kill him. He flees police, shedding his clothes, and jumping the eightfoot fence. Apparently someone jumped on a truck on the runway. Reporter now driving toward the runway. But police block him, so he doubles back, speeding toward the jet that was boarding passengers. Hitting the jets nose landing gear, dramatically shaking the plane. Again, we dont know if he was high on some type of drug, and that caused his behavior. David, Officials Say there was a lot of damage to the plane hit by the truck. And two crew members were hurt . A bangedup elbow and knee. Theyll be fine. But the damage to the jet, it has been taken out of service tonight. David, thank you. Now to a community in shock at this hour after two beloved nuns known for their work in the community were found murdered. Their car discovered nearby. Steve osunsami has the story tonight. Reporter this tenperson Police Department north of jackson, mississippi, has help tonight. Hoping to chase down the killer who robbed this community of two angels. Sister margaret held and sister paula merril were found stabbed to death in their home thursday. The two nuns, seen here in a ministerial video, were both nurse practitioners. We just see patients, and do what needs to be done. Reporter for more than 30 years, theyve tirelessly served the poor. They sang in church, and other sisters say they were great cooks. This is one of the poorest counties in all of mississippi. We make a difference in peoples lives, and we never know what that difference is. Reporter police tonight are tearing through leads, many from families who the nuns helped. Weve had a lot of leads and they are really supporting us as we try to find the people who did this. We got each others back over here, so when this happened, you know, its devastating. Reporter the Catholic Diocese says their home was broken into. Police suspect a robbery and found their missing car a mile away. They were originally from wisconsin and massachusetts and say they were called by god to mississippi. Prayers are up tonight for both the nuns and investigators. David . Just an awful story. Steve, thank you. We turn to the outrage and serious questions after a ho homeowner was shot by mistake. A mailman calling police during an armed robbery. He needed help for him and his wife. When police arrived, Authorities Say the man was shot by mistake. Heres linsey davis. Reporter tonight, newly released Surveillance Video a. Is that him . Reporter williams describes the man with a gun outside his indianapolis home. But the officer who responds ends up shooting williams. The only thing i can remember is intense pain, falling on the ground. And telling the Police Officers i am the homeowner. Why did you shoot me . Reporter tonight, williams is still in a wheelchair, recovering from injuries and demanding answers. I expect the police to come help us. I didnt want to take justice in my own hands. Thats the wrong thing to do. Reporter williams was armed with a pistol. And Police Confirm the officer took him for the robber. And were also tracking a tropical storm, with heavy rain and gusting win as it passes near the florida coast. Ginger zee is with us tonight. Ginger . Well, this type of storm doesnt need a name to drop a lot of rain. It has a 60 shot in the next 3 to 5 days of becoming a named storm. Its fighting through friction, wind shear, and dry air. So, thats what youre going to see on this map. The steering winds will take it, tracking south of florida, into the gulf. It looks like sunday into monday, it could go into some more favorable conditions. But were not going to stop watching it. Thanks, ginger. We turn to the race for president on a friday night. Many now asking where does donald trump stand on immigration, an issue that has been central to his campaign. Trump insisting a speech and firm policy are coming. Hillary clinton reaching out to independents and republicans, even naming republicans she has respect for when it comes to the issue of race in america. Heres jonathan karl. Reporter today donald trump declared himself proud for putting immigration front and center. Such a big problem for our country, he tweeted, i will solve. But aside from that wall, its less clear than ever how hed do it. This was trump in february. We have at least 11 Million People in this country that came in illegally. They will go out. Reporter but earlier this week he declared he was, quote, softening on that. Maybe not everybody would be deported. There certainly could be a softening because were not looking to hurt people. Reporter then last night you used the word softening, even last night on hannity, you talked about i dont think its a softening, i think its but 11 Million People are no longer going to be being deported. Ive had people say its a hardening, actually. But 11 million who have not committed a crime, theres going to be a path to legalization, is that right . You know its a process. You cant take 11 at one time and just say, boom, youre gone. Reporter so, does trump want to deport undocumented immigrants, or not . Were going to see what happens once we strengthen up our border. Reporter meanwhile, Hillary Clinton is aggressively trying to tie him to outright racism. Making the point that other Republican Leaders chose a different path. I called out to bob dole for what he said in his acceptance speech, that all racists should take the exits, and he pointed to the doors. I am still incredibly grateful that george w. Bush went to that mosque after 9 11 and john mccain, when confronted with the attacks on president obamas birth and his religion, basically said, wait a minute, hes an american citizen, hes a decent person. Reporter but clinton says trump is, quote, taking hate groups mainstream. Hillary clinton is going to try and accuse this campaign and all of you of being racists, which were not. And jon karl with us live. Hillary clinton giving credit to bob dole, john mccain, george w. Bush. She knows what shes doing. Reporter yes, trying to convince moderate republicans that donald trump is outside of the mainstream. He knows he has to broaden his appeal or he wont win. Jon, thank you. Tonight, the outspoken governor of maine is now igniting a new political firestorm tonight. Leaving a profanitylaced voice mail, threatening a lawmaker. David wright tonight with that audio. Reporter tonight, the Governor Paul Lepage is in hot water for being a little too outspoken. He left this voice mail. You [ bleep ]. I want to talk to you. I want you to prove that im a racist. Ive spent my life helping black people and you little son of a [ bleep ], socialist [ bleep ]. Reporter earlier this week, lepage was talking about known drug dealers. When he said this. 90 of the pictures in my book, and its a threering binder, are black and hispanic people. Reporter tonight, the governor is firing back at his critics. The enemy right now, the overwhelming majority of people coming in are people of color, or people of hispanic or gin. Reporter one of maines Top Democrats said the governor should step down. He says if he could, hed challenge his critic to a duel. We move on to a headline about fighting zika in america. The fda saying all blood donated should be screened for the virus. Overseas tonight, the death toll rising from the devastating earthquake in italy. Nearly 300 People Killed, and hope fading as rescuers use hightech cameras to search for survivo survivors. Workers helping families retrieve crucial belongings. And theres still much more ahead on world news tonight this friday. The sketches police hope may lead to a break in the case. And also, the small plane crashing nosefirst in the heartland. And a case of stolen valor. Authorities say the veteran who made up his injuries to cash in. American taxpayers paying the price. And how much did you pay . When we come back. 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Instead, lying his way into a purple heart by concocting a story that he was hurt when a rocket blew up his vehicle, even submitting a photo of a damaged vehicle from a different incident. His claims for benefits back home falsely stating he could not tie or fasten his shoes, buttons, or belt. That he was so severely disabled by ptsd symptoms that he spent two to five days a week in bed, in a fetal position. Yet investigators caught him on camera mowing his lawn. In fact, prosecutors say, as the checks rolled in, he practiced a normal lifestyle seemingly unencumbered by any disability. Coaching a High School Basketball team, even running as a candidate for public office. Wright could face up to five years in prison. Prosecutors say what cant be measured is the damage done to veterans who actually need their benefits. David . Neal, thanks. When we come back, the search for a serial shooter now intensi intensifying. The fbi now helping, and the sketch tonight. And the dramatic sos seen from the sky. How the stranded boaters got help. Oriatic arthritis with humira. Humira works by targeting and helping to block a specific source of inflammation that contributes to both joint and skin symptoms. Its proven to help relieve pain, stop further joint damage, and clear skin in many adults. Humira is the number 1 prescribed biologic for psoriatic arthritis. Humira can lower your ability to fight infections, including tuberculosis. Serious, sometimes fatal infections and cancers, including lymphoma, have happened, as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure. Before treatment, get tested for tb. Tell your doctor if youve been to areas where certain fungal infections are common, and if youve had tb, hepatitis b, are prone to infections, or have flulike symptoms or sores. Dont start humira if you have an infection. Want more proof . Ask your rheumatologist about humira. Humira. 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A huge sos sign in the sand spotted from the sky. They had been missing for a week. Incredible. When we come back, something we havent been able to get out of our head this week. Who can we blame . Our person of the week. Fore i had the shooting, burning, pinsandneedles of diabetic nerve pain, these feet played shortstop in high school, learned the horn from my dad and played gigs from new york to miami. But i couldnt bear my diabetic nerve pain any longer. So i talked to my doctor and he prescribed lyrica. Nerve damage from diabetes causes diabetic nerve pain. Lyrica is fda approved to treat this pain, from moderate to even severe diabetic nerve pain. Lyrica may cause serious allergic reactions or suicidal thoughts or actions. Tell your doctor right away if you have these, new or worsening depression, or unusual changes in mood or behavior. Or swelling, trouble breathin