set of wounds that the detectives couldn t figure out, deep cuts on her neck, which may have explained a horrifying sound. reporter: how would you describe that screaming? a squeal. allowed squeal. reporter: after he heard that, said a neighbor, he caught a glimpse of the man who may have been the killer. a slender young man with dark, curly hair. not much to go by. he looked at the back of the suspect as he ran down the driveway, into the street. carrying something? a small satchel. reporter: there couldn t have been much inside that black bag, because it was taken from lynn s apartment. only her wallet, keys and one particular piece of jewelry. she had a necklace on, a pendant. at the scene we found a broken clasp. but no chain? no chain.