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>> we did consider that her husband made known that she was having an affair. >> where was? she >> there were no. answers >> nearly 30 years, 60 investigators, and it all kept coming back to one elusive suspect. >> he just very commonly said, i know how to get rid of a body, so it would never ever be found. >> him? murder something that could be done over -- >> it was basically an hour never situation. >> hello, welcome to dateline. when kathy had cole disappeared, police didn't know if they are dealing with a missing person case or cold-blooded murder. with little evidence to go on,...

>> -- the afternoon kathy heckle went missing. >> they went to check his alibi out, 13 months later. not right away, and when they go there, a lot of videos to write in to show that he was golfing. the pages are missing. >> of course, -- could've also provided your husband. >> weeks after kathy disappeared, the defense noted, john heckle discarded some of her personal items. >> her husband throws away her purse, her wallet, her photo i.d.. it isn't that he throws it in a garbage can, in front of his house, it's in a dumpster in the back of the reserve base. >> you're saying he wanted to concea...