violent crimes and we need to take whatever means is necessary to hold them accountable. i think it makes the job of the police officer so easy. a brilliant young arc atekt mist yeariously died from a brilliant young architect, investigators needed to know if the stories were true. university park, texas, just outside of dallas is better known as the bubble. it's a place of privilege and prestige, an address many would like to have but few can afford.

>> it is kind of the beverly hills of dallas. that is the way the park cities is. >> nancy dellard lyon lived most of her life in texas. nancy met her husband, richard, while at harvard. they married and had two children. >> they had great energy, great friendliness. when they moved in they made gifts of ice cream and cookies and brought it to us. my husband used to say she was the nicest person in the world. >> nancy became the youngest partner in the history of a large real estate development firm but success came at a price. >> i think she always had, as many did at the time, a conflict between the amount of hours she wanted to work to develop her

career and time with her children. >> nancy was also experiencing some physical ailments. and on a january night in 1991 her symptoms included vomiting and severe stomach pain. her husband, richard, took her to the hospital emergency room. doctors were initially baffled. >> she was seen by multiple consultants, gastric disease, because of her multi organ failure. still she was not recovering. >> nancy's condition deteriorated but she provided doctors with a potential clue. she said she first got sick several months earlier after drinking some wine from a bottle left on her door step. >> she thought it was a gift from the neighbor.

it was just a house warming gift, so to speak. >> she drank the wine and became violently ill later that day. she had nausea, vomiting and abdominal pain. >> that had been months earlier. >> i suspected foul play but can't pin point anything. >> doctors sent her urine samples for testing. her organs failed and she was put on life support. >> it was clear that she was not going to recover. nobody could really understand it. >> six days later nancy dillard lyon was dead but doctors were suspicious and they weren't the only ones. >> i was married to a nurse. she had taken care of nancy dillard in the trauma center and

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when the daughter of a

wealthy dallas family, nancy dillard lyon died her doctor made two phone calls, one to the medical examiner to suggest a thorough autopsy. >> i said i have a patient and i suspect foul play. >> the other was to police. >> they thought the death was suspicious and needed to be investigated. it was suspicious and it was investigated. >> investigators learned that nancy was about to testify at the embezzlement trial of her former boss. nancy told friends she was uncomfortable at the thought of testifying against her former colleague. part of that may have resulted from a threatening letter she received. >> stay out of the bagwell case or you and your family will face the wrath of god. >> i guess it was a threat.

no one knew where it came from. >> at nancy's autopsy the pathologist found no signs of disease in her internal organs. but toxicology tests revealed some surprising results. nancy lyon had been poisoned with arsonic. >> all specimens showed significant amounts. it showed it was distributed through the blood. >> patients often don't know that they are poisoned since the symptoms are so common. >> people don't think about poisoning immediately and think it is a natural thing. nausea and vomiting is a common symptom. >> much of the poisonings that you see now are much more sophisticated variety that are harder to detect initially or after doing tests. so arsonic was a surprise.

>> the manner of death was ruled a homicide but questions remained. investigators discovered a receipt among nancy's papers, a receipt for arsonic. nancy's husband, richard, said he bought the poison to kill a colony of fire ants in the yard. and friends revealed nancy was depressed and discovered her husband was having an affair and the couple briefly separated. >> richard had met another woman. she felt he was going through a mid life crisis. at first her take was i'm going to stay patient and get counseling because she was just devastated really. >> i wouldn't discount a woman making herself ill or even taking something to make herself ill to get the attention of her husband.

>> yet, medical experts were skeptical that nancy committed suicide. >> i don't believe that for a minute. i mean, you have someone dying a very, i would consider hideous death, certainly capable at any time of voicing she had taken the poison because the symptoms are both painful and you certainly are deteriorating with this. >> absolutely ludicrous. she had two children she loved very dearly. she was young and had everything to live for. >> also among papers was a diary and it contained a blockbuster revelation. she accused her older brother, bill, of sexual abuse when they were younger. nancy said she feared her brother and questioned his ability to control himself. sex, sick sex the notation read. with me, my girls. nancy's brother angrily denied

the allegation but couldn't explain why she had written this in her diary. her family strongly suspected richard was the killer since they knew he was having an affair with another woman. >> i did not poison my wife, nancy dillard lyon nor did i have anything to do with her tragic death. >> so there was no shortage of suspects. who sent the wine to nancy's home? who sent the threatening letter? why did nancy accuse her brother of sexual abuse and would he kill to keep her quiet? and was nancy planning to divorce her husband? >> in the event that this case becomes a murder charge this will be an honest to goodness perry mason style who done it. how much protein

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investigators had plenty of suspects but little evidence in the poisoning death of nancy lyon. the only thing they knew is that nancy didn't kill herself. >> it's too painful, too drawn out.

it's a horrible way to die. and you're very aware and very conscious until the very end of it. there is no way to kill yourself that way. >> when a person ingests arsonic the poison attaches itself to the hair follicles. as the hair grows the poison residue remains on the hair shaft and becomes a permanent record. so scientists cut nancy's hair into seven millimeter pieces. each piece corresponded to a two-week period. each piece was placed in a separate vial and then exposed to radiation in a nuclear reactor. >> the sample can be analyzed as is in most cases and weighed in. most other methods require dissolution of the sample. >> when scientists examine the

air with gamma ray photometry they discover a startling piece of information. nancy had ingested small doses of arsonic every week starting four months before her death. the dose of arsonic increased four weeks before her death. the highest amount of arsonic was in nancy's system two weeks before her death. >> her levels were from four to 100 times what normal levels were so it was a very significant level and it was lethal. >> the forensic tests showed the poisoning started when nancy's husband, richard, moved back home after the separation. but richard wasn't the only person in nancy's life who had both motive and access. nancy's hand written diary alleged her brother, bill, had sexually abused her as a child. investigators wanted to know

whether this was a possible motive. to see if these entries were written by nancy investigators sent the diary to a forensic document examiner. >> hand writer examinations based upon two distinct facts, no two people write exactly alike. within the writing of a single individual there is normal variation. it is this normal variation that we associate or don't associate with the questioned writing. >> surprisingly nancy and richard's handwriting look strikingly similar. friends said this is intentional. while in college nancy had written some of richard's research papers. kittle looked at known handwriting samples from both nancy and richard. despite similarities there were differences. >> she used her ampersands quite

extensively through her writing, every fifth or sixth line would have it. whereas, richard always used and for the verbiage. >> kittle also noticed that nancy and richard made their capital is differently. >> richard used one down stroke like a 1 whereas nancy used a down stroke and then a cross at the top and bottom. she was willing to take a lot more time in executing them than richard was. >> their lower case fs were different, as well. >> richard used a clockwise motion coming down from the top of the f down to the bottom. he would swing off clockwise to finish the lower loop whereas nancy always went counter clockwise. >> kittle concluded richard

wrote the diary entries about nancy's brother, bill. >> absolutely certain that he had written that. >> 100% certain? >> yes. >> prosecutors now believed richard lyon had forged nancy's diary to cover up the murder. >> he never crossed his mind he was going to be caught. he thought he had it aced and certainly didn't think it would be his own handwriting. okay, listen up! i'm re-workin' the menu. mayo? corn dogs? you are so outta here! aah! [ female announcer ] the complete balanced nutrition of great-tasting ensure. 24 vitamins and minerals, antioxidants, and 9 grams of protein. [ bottle ] ensure®. nutrition in charge™.

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no one granted him the power of god to take her life. she was slowly poisoned to death. this wasn't done in a moment of passion or anger of picking up a weapon that was handed to him. this was done with slow, premeditation and over a period of time. and it is a hideous, hideous way to murder somebody. >> richard lyon insisted he had nothing to do with the poisoning death of his wife, nancy. as proof he offered a receipt for arsonic that he said nancy had signed. prosecutors asked forensic experts whether this was, in

fact, nancy's signature. >> i wasn't able to reach a conclusion. >> the owner of the company listed on the receipt told prosecutors all they needed to know. >> did you sell her these chemicals? >> no, i didn't. >> did you sell chemicals? i don't. is this a receipt from your business? it is a forgery. >> investigators discovered that arsonic was not shipped to the lyon's home but to a post office box richard opened. >> there is no reason for the world to have a post office box opened to get the arsonic. if everything is completely legitimate why aren't you having it delivered at home or where you work? because it is nefarious reason. >> in the hospital before she died nancy lyon told her doctor about a suspicious incident that occurred several months earlier. >> she said one time when we

were separated they had gone to the movies together and richard had got her a drink. when he brought it to her and she drank some of it and she said it tasted awful she said there was a white powder on the top of the drink. >> nancy said she became violently ill later that night and told her doctor something else. >> my husband has been giving me these capsules for the last several months. he says nancy these are like vitamins and are good for you. >> police confiscated every pill in the lyon's home and sent them for forensic testing. two pills tested positive for barium carbon ate, a toxic chemical used in the production of glass. despite suspicions nancy never directly accused richard of

poisoning her. >> nobody wants to believe that they are married to somebody who can murder because then what are you saying about yourself? >> and it's kind of outside the realm of most people's reality. i don't think she wanted to believe it. i think she was embarrassed or ashamed to say anything about it. >> prosecutors believe the motive was money and the desire to live with his girlfriend. >> he didn't want her. he wanted the family affiliations. it was partly money and partly just the position that he wanted and he couldn't have either one with just the divorce. >> prosecutors believe richard first tried to kill nancy by putting barium carbonate in her vitamin pills and may have put it in nancy's soda at the movies. when that didn't work he used

arsonic. forensic testing showed nancy started ingesting arsonic in september around the time she and richard reconciled. the fatal dose was administered two days before nancy was admitted to the hospital where she died. to hide his involvement richard created the fake invoice for the arsonic and forensic analysis proved that it was richard who wrote the sex-related entries in nancy's diary implicating her brother as a possible suspect. >> i think it was calculating. he thought himself as a lady's man. i think he was a cold blooded killer and did it in the most despicable way possible. >> richard lyon pled not guilty but forensic handwriting

analysis, timeline of poisoning captured in nancy's hair and discovery of poison in vitamin pills were difficult to deflect. richard's girlfriend even testified claiming richard lied by telling her nancy had a rare and fatal blood disease. >> anytime you catch a defendant or witness in a lie i don't think it coincidence that she is going to die from a fatal blood disease. i think those things immediately begin to color their view of him. he was a liar. >> it took a jury less than three hours to convict richard lyon of first degree murder. he was sentenced to life in prison. >> i worked lots of cases like this and the question was always why not just a divorce. >> they may be intelligent but are criminally stupid and for good reason.

thank god they are. >> it was hard for me to believe that he had killed his wife. it had finally broke down based on the shape of an f and l and r and just scratchings on a piece of paper. three women are in florida on vacation. >> these women thought this is great. we are seeing tampa bay. >> the evidence suggests they took a boat ride and then disappeared but there was little else to go on. >> there are hundreds if not thousands of miles to look over to find a piece of evidence. >> hairs, fibers, any finger prints would have been washed away. >> a public billboard turns citizens into investigators. >> i thought it was an excellent idea, brilliant.