S2/EP10 Before her disappearance, serial killer victim Connie Warner had witnessed a peeping Tom lurking outside of her home. Her daughter, Tracy Bryan, and her high school boyfriend also recalled seeing the same man. His description matched that of Derrick Todd Lee, who became known as The Baton Rouge Serial Killer.

S2/EP10 With a lack of convincing evidence, it took years before investigators could charge Derrick Todd Lee, who became known as The Baton Rouge Serial Killer, with multiple murders in Zachary, Louisiana. With the help of advancing DNA technology, authorities were able to obtain the proof they needed to charge him.

S2/EP10 Derrick Todd Lee, who became known as The Baton Rouge Serial Killer, murdered seven women between 1992 and 2003. Lee was sentenced to death by lethal injection in December 2004. He would spend the rest of his days on death row at the maximum-security Louisiana State Prison in Angola before his death from heart disease in 2016.  

S2/EP9 Forensic psychologist and author Katherine Ramsland spent five yers face-to-face with serial killer Dennis Rader, known as BTK, in order to write his autobiography. "Dennis Rader is definitely a cagey kind of guy, and he always wants to look for his own advantage and whatever angle he wants to use," Ramsland said.

S2/EP9 The murders of the four members of the Otero family were nearly four months apart from the murder of Kathryn Bright. Investigators discovered a unique set of square knots that were used to bind the victims of both crime scenes, helping them link both scenes to the same killer — BTK.

S2/EP9 Charlie Otero spent the majority of his life dealing with the hardship of losing the majority of his family at the hands of Dennis Rader, the BTK serial killer who terrorized Kansas. Years later, the near loss of his son taught him a lesson on the longing for revenge.

S2/EP10 In April 1992 in the small town of Zachary, Louisiana, investigators are working two murders: Connie Warner and Randi Mebruer. Both women were single mothers who disappeared from their homes just a block apart. In both cases, the victims' keys were missing from the crime scenes. Were they committed by the same killer?

S2/EP10 On Aug. 24, 1992 in Zachary, Louisiana, Tracy Warner Bryan calls her mother, Connie Warner, who does not answer the phone. Concerned, Tracy calls her grandfather to meet her at her mother's home. When they arrived, Tracy said she "just felt like the house was just not right."

S2/EP10 On April 19, 1992 in Zachary, Louisiana, one block from where Connie Warner lived, a little boy was found wandering in his front yard by a neighbor. She called the police department because she was concerned, and they did a welfare check on the boy's mother. Inside, they found a "horrific scene."

S2/EP8 Randall Woodfield is a serial killer who is thought to have murdered as many as 44 victims along the West Coast during an eight-month period in the early 1980s. Woodfield, dubbed the "I-5 Killer," is carrying out his sentence at Oregon State Penitentiary, where he is expected to spend the rest of his days.

S2/EP8 In 1981, Randall Woodfield was arrested for a string of murders and assaults along the West Coast. When looking into his background, investigators found that he had been on track to become a professional football player. Woodfield also came from a good town and a good family, but he had some early signals of sexual deviancy.

S2/EP8 Randall Woodfield, aka the "I-5 Killer," is suspected of killing as many as 44 people between 1980 and 1981. He briefly played professional football and used athletic tape to both bind his victims and use it as a disguise by placing a strip of it over his nose. "Sports tape is more of an anomaly in terms of binding material," said FBI Criminal Profiler Mark Safarik.

S2/EP9 In October 1974 in the city of Wichita, Kansas, police came across a second crime scene where victims have been purposefully tied up with intricate knots. This time, however, they had a survivor — Kevin Bright. He was able to get a good look at the killer and helped create a composite sketch.

S2/EP9 On Feb. 10, 1978, a letter arrives at KAKE-TV, a news station in Wichita, Kansas from the BTK serial killer. The author asked how many more people he had to kill before he got his name in the paper. The killer was looking for media attention, and in the note, he detailed his crimes and victims.

S2/EP9 A serial killer taunted Wichita, Kansas for decades with brazen letters taking credit for his horrific kills. At the introduction of the computer era, the killer gets sloppy and accidentally leaves a digital clue behind in his final taunt to police.

S2/EP8 In Lake Forest Park, Washington on December 21, 1980, authorities in the Seattle suburbs get two 911 calls within the course of an hour. An employee of a local restaurant had entered a restroom, and behind her, an assailant came in with a gun and sexually assaulted her. The attacker then left and told her to wait in the bathroom for five minutes before coming out. Another call soon comes in describing a similar attack 10 minutes away.