. >> but he did find small, broken blood vessels in the whites of jenna's eyes, known as petechial hemorrhages. >> they're in that constellation of findings that we refer to as stigmata of asphyxiation. tells me i need to look for a cause of asphyxiation. >> and he found it. jenna's larynx had been crushed. the conclusion was inescapable. >> this is a strangulation, and in great probability, manual strangulation by hands. >> a background check revealed that over the years, spencer and jenna had broken up several times, dated others, but always made up and got back together. >> knowing there were no signs of forced entry, i think you meet think, this was some kind of lovers' quarrel gone bad. >> we did ask spencer if he had killed jenna, and his response was "absolutely no." >> but would the forensic evidence support his claim? what's your favorite kind of cheerios? honey nut. but... chocolate is my other favorite... oh yeah, and frosted! what's your most favorite of all? hmm...the kind i have with you. me too. ...of america's number-one puppy food brand... ...with dha and essential nutrients a