hensley's focus was on someone else. he was fixated on the idea that susan's ex, michael, was the likely killer, especially after talking to susan's friends. their description of him was damning. everybody i talked to said, she's scared of mike. natalie morales (voiceover): gloria martin told hensley why susan was so afraid. when they finally broke up the last time, he left horrible, horrible notes all over her house and a cassette tape saying the most horrible things you ever heard about her and to her. and i remember coming over there, and she was just crying her eyes out. natalie morales (voiceover): the cassette tape michael left behind was a 30-minute rant of grievances about susan. did it sound threatening to you? it sounded crazy, irrational. and it sounded bad enough that when she got killed, i had no doubt in my mind who had done it. there was no doubt. it had to be mike. natalie morales (voiceover): hensley had heard enough. he'd developed some solid leads on suspects in stephenville, but he decided to set them