wxia reporter catie beck. >> i think those month built their confidence. built almost an arrogance that we're going to get away with this. >> so you can only imagine how it was may 21st, 2010, just after school. how did they react to being arrested? >> shocked. they -- they thought it was over with. it had been five months since they had heard from us. >> the arrest was big news in atlanta. two sweet, little girls charged with the murder of their mother. who would have thought? >> i mean, people were riveted by the story. >> oh, yes, they were. and when the twins finally told their version of events that as riveted all over again. >>> coming up -- >> we're all going to die today. >> the fatal struggle. did their mom start it all? >> charged forward. i kept telling her to stop. just stop. just stop. [brad] earth. the biggest apartment in the world. nearly six quadrillion square feet, housing over seven billion people. where all of humanity can live. apartments within apartments within apartments-dot-com. change your apartment, change the- [woman] yeah, yeah