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 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.
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 reasonable doubt. what was the weakest part about it? and it only takes one mosquito bite to transmit it. that s why you need to protect your dog with heartgard plus.
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? 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 becky together? you can t put em together. it s like a square and a circle tryi