they also found evidence of sexual assault. >> when the swab from the victim was analyzed in the dna section a male profile was developed. >> investigators were puzzled by the two electrical cords used to tie the sheet around denise's body. >> these objects i had never seen before. i was very suspicious as to what they even were. i had no idea. >> researchers identified them as a heat rock. >> a heat rock is a pretty simple device. it's a fake rock that is heated up by electricity and people use it to warm cold-blooded animals like a pet snake. >> investigators also found some unusual black hairs on the bed sheet. microscopic analysis showed these were dog hairs. >> my killer is going to own a black dog.