that revealed she was home alone. they had discovered that matt s cell phone was at or near jessyka s place for 17 minutes that night. reporter: police tech experts oscar dieguez and nick herfordt. so right now, it s about 11:00, and you re going to see a couple more activations where he s still at work. and right there and then all of a sudden it switches. reporter: and that s at her house. yes, that is directly in the area of the house. reporter: and there was more. the detectives had noticed a crescent-shaped cut on matt s hand. this could have been made by jessyka s thumbnail bending back as she defended herself. the fingernail swabs from her hands. and the blood in the house. he provided his dna sample. during his initial interview. we immediately brought that in.
the detectives noticed a crescent-shaped cut on matt s hand. could have been made by jessica s thumbnail as she defended herself. they found her dna under her nail and on the cord she was strangled with. now he played his hand snienlt i think you were there when it went down and i think you had something to do with it. and matt exploded. a stream of loud and determined denials. i didn t kill her. i don t know who did. i wasn t [ bleep ] there that night. i wouldn t be able to watch my uncle harry collapse over the body of his daughter at the funeral. here you are trying to accuse me of it. you arrest me for something i didn t do, especially on this. it s going to destroy our family. the lead prosecutor. he was narcissistic and he is a sociopath. if you were watching that interview without knowing the evidence we had, you might scratch your head and say do we