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An extra set of eyes, every time you drive. Good even. His story has captivated moviegoers all over america. Chris kyle the socalled american sniper, a military legend. Today, in court, the man who shot him to death went on trial for murder. The defendant is a troubled veteran whom kyle was simply trying to help. Today we saw emotional testimony from kyles widow and a revealing text message kyle sent shortly before he died. Heres my nightline coanchor byron pitt. Hold on i got a woman and a kid 200 yards out reporter its the blockbuster movie millions have flocked to theaters to see. Bradley cooper as the reallife american sniper chris kyle. But not seen on screen how kyle was gunned down, allegedly by marine veteran eddie ray ralph. Ralph, these pictures from his time in iraq is the man accused of gunning down kyle and his friend chad littlefield at a shooting range in february 2013. Kyle leaving behind two young sons and his wife tea. Yom now and always will be the wife of a man who is a warrior both on and off the battlefield. Reporter today the muchanticipated trial in texas beginning. Kyle shot five times in the back and side reporter the defense claiming ralph is not guilty by reason of insanity arguing ptsd from his time in the military made him turn the gun on two men trying to help him. When he took their lives, he was in the grip of a psychosis. Reporter first to take the stand, chris kyles widow tea. She isnt buying ralphs defense. Today in court she said as much with tears as she did with words. While the judge has banned audio recordings of witnesses, my colleague ryan owens is in the courtroom. One of the prosecutors first questions, who were you married to . Tea could barely whisper the words chris kyle. Reporter a wifes plea to the jury made up mostly of women, ten women, two men. Id be far more concerned about the fact that its ten texans than ten women. Texas is not where you want to be presenting an insanity defense if youre the defendant. Is it enough for the defense to say theres evidence of this guy was mentally ill, for him to therefore not be held responsible for the deaths . Not enough to just say mentally ill. You have to be able to demonstrate the Mental Illness was so severe that he didnt understand what he was doing is wrong. Reporter the blockbuster movie hangs heavy over this case. The highestgrossing war film of alltime. Who how would you describe chris kyle . Awesome. Because hes so imposing. Hes clearly an individual that you would never, ever want to mess with. Reporter it all the search for an unbiased jury a difficult task. Potential jurors had to fill out a fourpage questionnaire, gauging the details of the chris kyle story. The jury in this case is not being sequestered. Sequestering a jury is a big deal. Theyre almost never sequestered. Its an enormous burden. Reporter kyles legacy was larger than life. 7,000 people in attendance at cowboys stadium for his funeral. Chris always said the body will do whatever the mind tells it to. Im counting on that now. Reporter just a little over a week ago the governor declared a chris kyle day in texas. Chris kyle day. Reporter notoriety aside the question for this jury is not if ralph pulled the trigger, but rather, what drove him to do it. When he shot these was it intentional and knowing . Reporter the eddie ralph seen in court is different from his mug shot. In a stark difference from these pictures, trying to hit home the insanity defense in opening arguments the defense presented Text Messages between chris kyle and chad littlefield as they rode to the gun range with ralph in the back seat. I think its very helpful to the defense that chris kyle himself is saying this dude is straightup nuts. Because thats exactly what the defense is saying. Reporter prosecutors hope to paint an even more extreme picture. Ralph with a history of violence and drug abuse. He admits that he murdered these two men, that he used drugs and alcohol that morning, and that he knew what he was doing wrong. Reporter prosecutors alleged he showed up at a family dinner and made threats to kill family members and himself, leaving shirtless, crying, and intoxicated. Whats more, while in jail for a drunk driving conviction in 2012 prosecutors say he told officers, im a marine i have ptsd. Author laura beal of the enemy within the inside story of eddie ray ralph, spent time with ralphs mother. He was raised just like a texas boy would be raised. He had been kind of rebellious as a teenager. He was really intent on joining the marines. Reporter his mother telling beil he was very disturbed by his time overseas and in haiti during the earthquake of 2010. He wouldnt talk a lot about it. But they did notice something was different about him. By the time he came home. Reporter ralphs mother had reportedly sought help for her son. She approached chris kyle who she knew was well known for his work helping veterans. He said im going to do everything i can to try to help your son. Reporter brandon webb kyles sniper instructor, has battled ptsd insisting its a treatable diagnosis, not a defense for murder. I dont believe he suffered from ptsd. I believe he was mentally ill. And i think thats a big difference. And had chris known that this was a person that was suffering from Mental Illness, not a veteran suffering from posttraumatic stress i dont think chris would have ever found himself on the shooting range with this guy. Reporter back in the courtroom today, the prosecution argues the same sentiment. Mental illnesses dont deprive people of the ability to be considered to know right from wrong. Still obey the law. And at the very least not murder them. Reporter the defense argues the system may have failed him. Eddie ralph was suffering from a severe mental disease that he did not know his conduct was wrong. Reporter however eddie ray ralphs trial ends the debate over ptsd Mental Health, the high price our veterans pay, all will linger a long time, as will the legacy of chris kyle the american sniper who risked his life to serve his country. A story more compelling than any hollywood could produce. Im byron pitts for nightline in new york. Up next on nightline, what Kevin Costner, who played Whitney Houstons bodyguard, said today about houstons daughter Bobbi Kristina, now fighting for her life. And why this is now a confirmed criminal investigation. Ne is proven to help people quit smoking. Chantix helped reduce my urge to smoke. Some people had changes in behavior, thinking or mood hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. Some people had seizures while taking chantix. 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Come on clap your hands noits noits reporter a motherdaughter bond that flourished in the limelight. But three years ago tonight, that relationship severed when Whitney Houston, one of the mostcelebrated voices of her generation drowned in a bathtub in a Beverly Hills hotel with a cocktail of drugs in her system. Tonight family members praying for Bobbi Kristina brown, who was found in an eerily similar scene at her home in georgia. Tabloids have been reporting Bobbi Kristina would be removed from life support on this grim anniversary. But her father former r b star bobby brown, releasing an emotional reaction to those reports saying theyre egregious, false, and will be dealt with at an appropriate time. Bobbi kristinas aunt speaking out to fox adding that her condition is actually improving. Shes opening her eyes. And theres a few more things that shes doing. Crissy is doing well right now. Thats sometimes almost a false message of hope. Reporter newer at dr. John bookfar, who hasnt treated Bobbi Kristina, says in these cases even eye movements can be misleading. The eye opening in her case may completely be of a reflexive eye opening, one that means that she has improved to this persistent vegetative state, which is not a great end point. Reporter despite reports of diminished brain function, family and friends refuse to give up hope. And i reporter Kevin Costner played opposite Whitney Houston in the bodyguard which featured her signature hit. I will always love you when we see Bobbi Kristina in peril were wondering if you have any thoughts to share. Shes fighting for her life surrounded by people who love her the most. I think nobody wants more than her family and if she could speak for herself, to have a Second Chance at this most precious life were all given. I hope god opens her eyes and lets her breathe and lets her brain work ask she gets a Second Chance. Reporter ever since Whitney Houstons untimely death Bobbi Kristina has publicly struggled with the loss of her mother. The family allowed lifetime access to intimate moments in the months that followed including Bobbi Kristinas first visit to her mothers grave site. The way she walked. The way she talked. The way she smelled. Reporter the cameras capturing 19yearold bobbyi kristina drinking alcohol. I know that im not her mother but i have to look out for her. Reporter something that disturbed and worried her aunt. And this behavior is unacceptable. Reporter its been 12 days since she was found facedown in a bathtub by her boyfriend nick gordon and a friend. Possible cardiac arrest. 21yearold female in the bathtub, fatedown. Cpr in progress. She is gurgling at this time. Reporter since she was hospitalized questions have been popping up around gordon the man Bobbi Kristina described as a her husband, a man who for a time was raised like her stepbrother. Today police confirming there is criminal investigation under way. Thats the way Police Departments should conduct investigations, treat every death as suspicious until evidence proves otherwise. We were told she was found facedown in the tub. Thats a red flag. We have to know about positioning, where the body is is she clothed . These are things we dont know yet. Reporter with few details emerging from the investigation questions continue to swirl about what actually happened to Bobbi Kristina that day. You have to look at the house, if theres anything knocked over sign of a struggle. If you are thinking that this is a criminal act, the criminal act might not have happened in the bathroom. It might have happened somewhere else in the house. Reporter theres renewed scrutiny over a 911 call made roughly a week before Bobbi Kristina was found unresponsive. Neighbors then complaining about a domestic disturbance. Just had a neighbor call and report there was people hitting each other, swinging outside in front of their town homes. Reporter but when police arrived, they found nothing but an empty house. Gordon also. Theedly had a restraining order filed against him by Whitney Houstons sisterinlaw, the executor of the 20 million estate Bobbi Kristina inherited. In court papers posted by Radaronline Gordon was accused of making threatening comments and posting photos of guns with the intention of making her fearful for her personal safety. Bobbi kristina wanted to follow in her mothers footsteps, singing one of whitneys early hits im your baby tonight in her lifetime reality series. That magic boy that is making me fly. Reporter its a love of music we saw early. At 11 months old when Bobbi Kristina joined her mother onstage at the American Music awards she couldnt resist the allure of the microphone. Her family has been keeping visible jill by her bedside as they wait hope and pray. Telling entertainment tonight do you see a positive outcome . I do. Because i know the power of god. I know what he can do. Reporter for nightline, im juju chang in new york. Coming up here on nightline, how Eddie Redmayne went from rockhard abs in jupiter ascending to a body wrecked by a. L. S. In the theory of everything and what happened when for the first time he met Stephen Hawking, the sigh disk icon he portrays. Ok, if youre up there, i could use some help. Smart sarah. Seeking guidance. Just like with your investments. That sets you apart. It does . It does. Youre type e. And seeking another perspective is what type e s do. Oh, and your next handhold. Is there. You dont have to go it alone. E trade gives you the support and guidance to make informed decisions. Are you type e . The nissan rogue, with safety shield technologies. The only thing left to fear is your imagination. Now get 0 financing or up to 1,000 back on the 2015 nissan rogue. Nissan. Innovation that excites. It may not be a household name yet but Eddie Redmayne is considered a real contender for best actor. As abcs Chris Connelly found it for our series oscar confidential, redmayne has other hidden talent. Oh, here we go. Should we make it interesting . Reporter look whos hawking. 33yearold Eddie Redmayne, best actor nominated for his role in the theory of aefrg as Stephen Hawking. Taking a break from the awards season car wash at the standard downtown l. A. With the game he prefers, pingpong. I come from a family of very good sportsmen. And im genuinely horrifically untalented. Reporter athletic enough though to undergo four months of prep and physical transformation to play a man increasingly constrained in his own movement. Sixpacked from his previous shoot on jupiter ascending, redmayne reconfigured his body. He sought to capture hawking at each specific stage of his decadeslong battle with a. L. S.