katie as mary's killer. the evidence will show that all roads lead to caitlin conley. strategy. he said, yes, katie was innocent and yes, katie was framed. but this time her lawyer was pointing the finger not at bill, but at someone else. ladies and gentlemen, it was adam. it was adam. andrea canning (voiceover): adam, mary's son. defense attorney frank policelli argued that the crime happened just the way katie described in that letter. frank policelli: he put the colchicine in her supplements when he was over there, either mother's day or father's day, when he had a falling out. andrea canning (voiceover): as for how katie's digital fingerprints ended up on everything related to the colchicine transaction, katie's attorney suggested that could easily have been adam. how do you know, first of all, that she was the one that was researching the poison. since adam had total control of all of her electronic equipment any time he wanted it. andrea canning (voiceover): a key witness this time was adam's cousin and former roommate, david king. in the years since mary's death,