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You're under arrest for murder. >> chris would do anything for his mom and she knew it. >> including kill the lady next door. >> and he did. >> reporter: and the woman behind it all? they arrested her and charged her with murder as well. >> where do you take down becky? >> she was staying at a hotel, at a holiday inn. we took her down in the hotel room. >> reporter: tamara baldwin could not begin to comprehend the news of their arrests. >> the becky with the murderous plot and the becky you knew from sports games and on your cruise and backyard get-togethers, how do you put those two halves of...

We took her down in the hotel room. >> reporter: tamara baldwin could not begin to comprehend the news of their arrests. >> the becky with the murderous plot and the becky you knew from sports games and on your cruise and backyard get-togethers, how do you put those two halves of becky together? >> you can't put 'em together. it's like a square and a circle tryin' to fit together. i didn't see the square. all i saw was the circle. >> reporter: it didn't make sense to tamara, and it didn't make sense to becky and chris' defense attorneys either. as they saw it, the state's case was riddled with...

>> so he's lawyered up, chris. >> he's lawyered up. >> reporter: for investigator edmunds, the puzzle pieces had finally fallen into place -- becky had the motive to kill kay and chris, with his devotion to his mother and access to the murder weapon was her means >> go ahead and, uh, stand up. place your hands behind your back. you're under arrest for murder. >> chris would do anything for his mom and she knew it. >> including kill the lady next door. >> and he did. >> reporter: and the woman behind it all? they arrested her and charged her with murder as well. >> where do you take down becky?...