Dr. Karin Cain met Dr. James Craig at a dental conference in Las Vegas in early 2023. 21 days after they parted, Craig’s wife and the mother of his six children mysteriously died . In that timespan, prosecutors say Craig researched poisons and then bought arsenic, cyanide and other deadly substances and used them to kill his wife, Angela Craig. A new "20/20" episode, "21 Days to Murder," airing Friday, Sept 19, at 9 p.m. ET on ABC and streaming the next day on Hulu. Cain, an orthodontist from Texas, was unwittingly ensnared in the murder investigation. Speaking exclusively to ABC News, she said only now is she coming to terms with the full scope of James Craig’s deception. "It's still just like there's this person that you think you know so well," Cain told ABC News' Matt Gutman in an excl

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