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One of the most extraordinary cases. A murder just months after her wedding. She gave me a big smile and i remembered that smile for years. All the time the killer was hiding in plain sight. No indication she was ever spoken to . No. And then a new detective took a look at an old lead. He said its a match. A person no one would have ever suspected of murder. We were going to end this. Was suddenly suspect Number One. Perfect murder. Almost. Hello and welcome to dateline. She was found murdered and what happened to her remained a nightmare. But when detectives reopened the case, they discovered...

>> i'm so excited for the announcement tonight. tune in, pay attention, listen closely. four more years. >> subtle. it is a blow for former south carolina governor nikki haley who is the one appointed then congressman scott to his senate seat. senator scott is on the medium list for a trump vp pick as opposed to the short list. kylie atwood is in new hampshire. nikki haley reaction to this endorsement and the timing. >> reporter: this news broke while nikki haley was at the campaign event, one of six campaign events in new hampshire today. she did not really respond to initial questi...

serve in congress. our panel will share their thoughts on that special number. plus, the case of the ex-buffalo bill player, matt awry sa, a rookie who was cut from the team after ugly accusations went public. now prosecutors have declined to press criminal charges against him. was his career ended prematurely. and the lawsuit by parents and authors against a florida school district that's been removing books from shelves, freedom of speech versus parents' rights. which one will win. let's begin with dianne feinstein and questions about her fitness for office. she was out of wo...

Home invasion gone wrong. her bmw was missing. there was no sign of the murderer weapon. but detectives did recover two .38 caliber slugs and something else caught detecti detective's attention. >> on the inside of her left arm, there was a bite mark. a crime scene analyst swabbed the mark for saliva that could belong to the killer. >> reporter: dna of whoever bit sherry. this was before dna testing technology would arrive, that could link a suspect to a sample like this one. back then, the dna was not much help. but the swab was carefully packaged and bundled with all the other evidence. for ...

Wrong. >> sherri's bmw was gone, a present from john. there was no sign of the weapon, but detectives recovered t two .38-caliber slugs. and there was something else that caught detectives' attention. >> on the inside of her left arm they found a bite mark. a crime scene analyst at the time went ahead and swabbed the mark for any possible saliva that could possibly belong to the killer. >> saliva that would contain dna from whoever bit sherri. remember, this was 1986. years before dna testing technology would arrive which could link a suspect to a sample like this one. so back then the dna was...