used drugs. >> 27-year-old gabriel ferris came from a well-to-do family in saginaw, but had spent time in prison on drug charges. ferris had dated the victim. detective reeder met with ferris several times and something about the guy didn't seem right to him. >> i received a call from gabe ferris, and said, i understand you're the investigator, i would like to talk to you. and then he's asking me all kinds of questions about the homicide, and he became very suspicious to me at that point. >> did you think that maybe this guy was the killer? >> absolutely. >> just by his behavior? >> right. my instincts. he was very nervous. i was really suspicious of him. >> although he didn't have the dark hair that matched what was found on the victim's body, other pieces of the puzzle seemed to fit. ferris admitted to having a sexual relationship with cheryl miller up to the week before her murder. and police found ferris' fingerprints on a dresser near cheryl miller's body. still, ferris seemed to have an alibi as solid as any imaginable. he said the night of the murder, he was 65 miles away in a c