this is "nightline." tonight the perfect nanny, a wife and mother of eight's sudden death and now the warning. the interviews and one daughter's suspicion. >> she said rachel, dad murdered mom. i mow know he did. >> and their father's affair with mistress turned nanny. plus the bombshell twist in a courtroom showdown. >> this bathtub has an important story to tell. >> the children's search >> i looked at my father, and i

showed him how i felt with my eyes. >> and the stunning final twist to one family's twisted reality. >> "nightline," the perfect nanny will be back.

"nightline," the perfect nanny continues. michelle summers, she's

gorgeous. >> she's just beautiful on the inside and out. very graceful and classy and loving. >> michelle was ju21 years old when she met martin mcneill, and within months they elope and got married and began a family. very quickly. >> boom, boom, boom. >> they adopt children from ukraine. >> and that's it off in the distance. >> and the family grew to not just four children but eight. >> martin mcneill was appointed by the governor of utah to head up a very large medical facility. >> he walked in the room and sort of took it over like he was above everybody. we did try to warn her. he had total control. when my father turned 50, he stteacng very strangely. he became just very obsessed with losing weight and his appearance. >> how did your mom react?

>> she was suspicious. michelle became very suspicious and confided in her daughter alexis she thought her father was having an affair. >> michelle confronted martin mcneill with allegations of an affair. and ever the manipulator, he turned the tables on her, martin mcneill convinced her she needed a full-on face-lift. >> she was afraid she was losing her husband. martin found a plastic surgeon and came in with a list of things that he wanted michelle to have. michelle ended being pea described percocet, lortab, valium, aim been, phenergan. >> he wanted his wife to go home with lots of prescriptions for sedatives and painkillers. the surgeon deferred to dr. mcneill because he was going to

take care of his wife personally. >> reporter: when she came out of surgery, how did she look? >> she looked bad. >> reporter: the next morning when you saw your mom she was heavily medicated. >> she was completelisa date coe and out of it. >> he gave her more medicine. i said no, i'll take over. >> she started to cry. she said p anythiif anything ha me, make sure it's not your dad. i kind of got upset. >> reporter: the night before alexis went back to medical school, alexis said her mom looked great. >> he went into work as normal, picked up ada from school and arrived at the house around 11:35. >> she ran in calling "mommy, mommy." my dad stayed in the kitchen while she went into the bathroom

and found her. and then she screamed for my dad. >> fallen in the bathtub! she is unconscious. she's under water! i need help! >> they're on their way! is your wife breathing? >> she is not. i am a >> reporter: martin mcneill decided to call his daughter alexis. >> she's in the tub, she's not breathing, i called an ambulance and he hung up. and i was just screaming, he killed her, that was my first instinct, he killed her. >> she said dad murdered mom. >> reporter: martin has had somebody flush all of michelle's medication down the toilet. >> as soon as i heard that, things are starting to add up. my mom was concerned, because rather than spending more time at home he's spending more and more time away at the office. while he was sleeping, i printed out all of his phone records,

and we found this number that he'd been calling a lot, gypsy jillian willis. >> reporter: gypsy jillian willis was a woman that martin mcneill had met online. did you know he was married? >> i did. >> my father demanded that we have a funeral within just a couple of days. >> among the crowd was gypsy jillian willis. >> reporter: you crashed her funeral? >> i had felt sorry that i had been involved with martin inappropriately. >> we'd come to find out that my dad had been dating gypsy for several years before my mom's death. >> martin had a set plan right away. he was going to hire a nanny. >> and he said there is going to be an interview for a nanny, and that was gypsy. >> gypsy. >> reporter: why did she move into the home? >> martin said he needed help with his younger children. >> reporter: were you still sleeping with him? >> i was. >> reporter: so were you the nanny or the girlfriend?

>> i had moved in to help with the kids. when we had opportunity, i still slept with him. >> reporter: so you were both. >> she walked into the house like she owned the place. and then when i questioned my dad, and he said oh, she's a guest in the home. >> he wanted to make it known that it was either gypsy or his children, and he chose the nanny. >> reporter: you must have been shocked when three months after she died he proposed marriage to you. >> i wasn't shocked. seemed like a natural progression. i believe he did love his wife. he mourned michelle, but she was gone, and i didn't suspect anything unusual. >> police didn't really conduct much of an investigation at all. they didn't collect any of the evidence, closed the book on this case and ruled it a natural death. >> reporter: michelle's daughters were absolutely outraged that the police closed the case so quickly on michelle's death. and alexis and rachel and michelle's sister began their

own investigation. >> we said, you know, we have this new information. we know about a girlfriend now. they took no notes. they acted like we were out of our minds. >> in talking with the investigator there in pleasant grove, they felt like this was all a natural cause kind of thing. could they have done more? they could have. but i think the initial response was appropriate. >> doug whitney and jeff robinson were two people with the prosecutor's office, and they were assigned just to work special cases. >> i got information from the daughters and got enough to get an investigative subpoena. >> reporter: doug whitney began investigating everything he did and uncovered a life of lies. >> when he was in his early 20s, he went to jail for check kiting. >> he was charged with forgery, fraud. >> okay, i'm going to take a picture. >> we basically found out our entire lives had been based and surrounded on lies.

that everything about our experience with our father was a lie. >> you played a part in destroying our whole family, dad. >> i am the victim, i am the victim. my logic is i didn't commit adultery. i didn't kill your mother, i didn't have a mistress. i don't have one now. whether you want to accept it or not, i've done nothing wrong. >> reporter: michelle mcneill adopted four girls. >> and i saw this little girl, and i said i have to have her. look on the computer when she's 8, and i said i've got to have her. >> reporter: elle, ada, sabrina and gisele. >> gisele was the oldest adopted family member. a few months after michelle's death, he decided to send gisele back to the ukraine for the summer. >> he sent gisele back home to the ukraine for two months, but then those two months began

vetching into almost a year. the rest of the family couldn't understand why gisele didn't come home. little did they know that mcneill and gypsy willis had taken gisele's social security number. gypsy willis assumed gisele's identity. >> reporter: how did this idea come up? >> when i got together with martin, i had a lot of tax debts, probably in the range of $50,000 or $60,000. this was martin, this was martin's idea. this was martin's activity. >> reporter: why did you do it? >> i said i didn't want to. he said this is the best 2003wa do it. >> reporter: you got three joint bank accounts using a fake name, a fake birth certificate, a fake utah state i.d. card and a fake social security card. how can you be a passive participant in that? >> he was very powerful and influential.

i just assumed he knew what he was doing. >> gisele had no idea what was going on. she set plans in motion right away to bring her back. >> her last day in ukraine! thank goodness, she's excited. >> reporter: what the family didn't know was this incredibly passionate move to bring her home would put a total wrench in all of martin's plans. >> now there's two people with that social security number and that name. >> martin and gyp swsy were bot arrested and sentenced to separate prisons where they served time for the identity theft. >> reporter: martin is gone but not forever. he's only behind bars for four years, so the family knows he'll be out eventually and leaves time to wonder what else is martin mcneill capable of doing. >> investigators became convinced martin killed michelle

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cause to think there's foul play here. >> michelle's sister pushed and pushed and pushed until authorities agreed to review michelle mcneill's toxicology report, and when they did, they found a toxic drug cocktail. finally success. it was changed from natural to undetermined. long story short, undetermined opens the door to the possibility of murder. >> martin mcneill was charged with murder of his wife michelle. after long years of fighting for justice for michelle, there was such tension around finally going to trial the defense's position was that michelle died accidently. the prosecution presented a case that martin had meticulously plotted michelle's death. dr. scott thompson was the plastic surgeon who performed e t. >> hydrocodone, two pain

medication prescriptions. >> why did you prescribe it here? >> because martin was a physician and asked me to prescribe these things. >> was it your inessential that she take these things together? >> no. >> this bathtub has an important story to tell. there's about an hour and a half period of time where nobody knows where martin is. rush home, give michelle the drugs? fix her up a bath, get her in the tub, hold her head down? martin described finding michelle in the tub as if she was outside the tub but bent over with her head under the water when in reality she was found entirely inside the tub with her head up above the water. >> reporter: inmates learned he was suspected of h wife after watching a television

show. >> he just pretty much opened up about it. he said he had gave her some oxy and sleeping pills and got her to get in the bathtub. >> did he say what he did next? >> later on he just said he had to help her out, and i asked him what that was, and he said he held her head under the water for a little while. >> the jury was left trying to determine who was telling the truth. dr. martin mcneill? or an inmate in the texarkana federal pen. >> it was about 1:15 in the morning when the jury came in and delivered their verdict. >> mr. mcneill, if you will stand please. >> we the jury fine the defendant as to count one, murder, guilty. >> i burst into tears. >> as to count two, obstruction of justice, guilty.

>> it took ply breasmy breath a. >> gypsy willis was never charged with murder because we couldn't prove she was involved, as either a direct participant in michelle's murder or an accessory. we believe she was the motive, but we didn't have the evidence to prove that she murdered michelle or was an accessory to her death. >> so many people think you must have known. >> no. >> or that you were in on it. >> that is incorrect. i don't believe martin murdered michelle. >> reporter: what would you say to alexis and rachel? >> i am so sorry for any role i played in anyone's pain. >> i don't think she has any remorse. she's an evil person. >> reporter: in 2017, martin mcneill delivered one more shock to the family. >> a utah doctor who murdered his wife was found dead today at the utah prison. it appears to be a suicide. >> alexis called me and we both

screamed and cried. >> he had recently lost liis appehis appeal and was going to remain in prison. >> rachel and i were standing over his body, seeing him in the funeral home. >> i was able to tell my father that i forgive him, that i loved him and not feel fear. and not feel anger. >> i was able to let go of the feeling that hatred and pain and just obsessing over my father's act. >> alexis ended up successfully adopting her little sisters and has raised them with ada, sabrina and elle. >> reporter: alexis is now married with children of her i >> i can't imagine how much joy she'd have with my children, being in our lives. she's missed out on so much. >> we celebrate her every january 15th, balloons and cake,

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finally tonight, a program reminder. >> we got it covered. come on, let's go. >> you don't feel like you're behind right now. >> i haven't even started yet. >> do you find you can use the power of this setting to get your way? several of even your republican senators when you came in were skeptical of you, and now it seems they are 100% in line. you are president of the united states, you seem to feel this need to push back at perceived enemies. >> no, at false story, at fake news. >> so a president can't obstruct justice. >> a president can run the country, that's what happened, george. >> when a president does it, it's not illegal? >> let me just tell you something, i did nothing wrong,

george. >> president trump, 30 hours, only and abc. >> don't miss it, and never miss "nightline." full episodes are available on hulu. thanks for watching, have a freight weekend.

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