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Those tapes with the confidential informant, matt walters. >> like if it was me, i would have gone back in color fingers off. i would've burned them. i want to let the house on fire. >> what did you think when you heard that, knowing there was a two-year-old child in the house at the time? >> i thought, well, those are strong words, that is a lot of hay. >> but was it? or was it something else altogether? a few days before that scene in court -- >> hello? >> yes, hi. >> this is cynthia wilder. >> we interviewed cindy by phone from the ward county jail in minot. how would she -- how could she e...

>> reporter: the wind on the prairie is a fickle thing, like people sometimes are. is that why angila wilder's fiance, chris, was so angry? >> richie is probably the -- piece of -- who did it. >> reporter: there was a history to this. long before that november morning in 2015, and far away from minot, north dakota in alabama. angila met richie at church. they were the best of friends as kids. and, after angila had a baby as a teenager, it was richie who scooped her up. married her. adopted her little girl. and before long they had a boy of their own. all witnessed by angila's sister, crystal. ...

She could have up to two jobs at a time, still attend her classes and take care of her kids. >> reporter: why did richie and angila's lifelong bond rupture? who really knows, but theirs curdled into a corrosive, toxic anger. richie was court martialed. convicted of domestic abuse. drummed out of the military. a divorce followed. and then, like the prairie wind, their affections shifted. richie re-married. a small town north dakota girl named cyndi who'd moved to minot and become a kindergarten teacher. and soon cyndi and richie had a baby of their own. and angila got engaged to chris. and she ...

Or was it something else altogether? a few days before that scene in court -- >> reporter: hello? >> hello? >> reporter: yes, hi. >> this is cynthia wilder. >> reporter: we interviewed cyndi by phone from the ward county jail in minot. how would she -- how could she explain all those terrible things she said to matt, on tape? her answer was also her legal defense. >> i mean, i'm lonely, and i was trying to see if there could be any sort of relationship. and i was kind of, well, trying to impress him because i -- >> reporter: you were trying to impress him, did you say? >> yeah, 'cause i know h...

My son's inside with her and everything. i'm about to go in and see what the -- is going on. >> okay, why don't you just wait for officers, i'll get 'em over there. >> reporter: so the fiance stayed outside. the officers went in. the house was neat, tidy. they found the 2 year old. unharmed. they went down the hall. looked in the next bedroom. and there she was. very dead. >> i didn't know at the time exactly how many times she was stabbed. but i knew that it was vicious. >> reporter: minot police detective sergeant dave goodman. >> how many eventually did you how many stab wounds? >> somewher...