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've never seen before. i was very suspicious as to what they even were. i had no idea. >> research identified them as heat rocks. >> a heat rock is a pretty simple device. it's a fake rock that gets heated by up by electricity. people use it to heat warm 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. my killer is also going to own a reptile whether it be a snake or