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>> they made in vegas, a professional poker player. >> he said he's making good money mad at it. >> a former trap ease artist -- she fell for it. but she didn't gamble on this. >> i could smell the odor of decay and blood. >> or this -- >> at every turn there was another -- >> married, with a child, and women in multiple cities -- >> what else is he capable of? >> capable of murder? he had an alibi. >> credit card transactions and phone records of me from las vegas. >> but could this little card holds the key? >> we just a shot in the dark? >> absolutely. >> we see a calculated kille...

there must of been something at work. >> that's what police thought to until they learned about the secret life of this husband and wife. >> we met people in an. it >> was their forbidden affair? >> they were probably meeting for sex about four times a. lead >> and didn't lead to murder? >> she is absolutely cold blooded. >> soon there will be questions for mother and daughter. >> give us another shot. welcome to dateline. when a respected military officer was attacked in the middle of the night, police launched an investigation that would reveal eyebrow raising secrets that might ho...

defenseless. she reached out and somerset, help me. >> my heart dropped. i want to know why. why? >> it is a baffling case of murder. a mystifying piece of tape. at the center? husband and wife. self made millionaires. >> he was very caring and loving. >> she had a personality that such a win. together, they meet the cold business. that, someone else made a killing two. >> it was to make sure she was dead. >> his wife, ambushed by a shadowy man in black, with someone after their fortune? >> i called her to run her. was the answer on this table? >> was his wife been killed at that exa...

>> also no evidence. but police found a dark side behind that bright suburban facade. >> she slept with the children and the door locked. >> and finally a vital clue. what happened to nancy the day she disappeared? welcome to dateline. a young mother disappeared one her husband said she went for a run and never came home. the puzzling case happened in a safe, suburban neighborhood where crime is unexpected. but sometimes there are secrets hidden behind closed. >> it all seemed like such a bad -- >>. >> it. . at >> reporter: it was a saturday morning in july. the happy little world su...

>> a sudden slip, a fatal fall -- >> you losing your mother, watching her go right -- >> someone else was watching her too, a curious neighbor. >> it was scary. the look on his face was almost indescribable. >> what had she seen? was this drowning really an accident? >> she's got a huge gash on her head. -- consistent with just falling down. >> a husband and father is suddenly under suspicion. >> who is crying, were crying. he said, they got -- >> three daughters stand by their dad, and one prosecutor stands firm. >> he's holding his wife of almost three decades under the water and -...