this was an ex-boyfriend named joe giarusso. after dinner lynne and joe drank some wine, talked about what we cannot know, and then at 11:30 or so, he left. and lynne went to bed. early shift at the hospital. outside, the street was silent. wednesday ticked into thursday. that's when the neighbors heard it, couldn't help but hear it, a high-pitched scream. and it came from lynne knight's little apartment. it was a scream that would echo down through the years and change so many lives. >> my whole world crashed in. >> reporter: 35 years later, the scene in that apartment would still leave a hardened homicide detective in tears. >> you'll have to excuse me. he leopard print. sprint told us they'd cut our verizon bill in half. oh yeah. we'd save a bunch of money on our rate plan by switching to sprint. but we don't need to save money, do we mama? oh, no. no we do not baby. ... to the other lady in leopard print. like daddy always says 'money doesn't spend itself'. 1 million oh, look at that. oh! oh wow. look at that muscle baby. it'