Episode 77: Yvan Keller.

Yvan Keller was a French serial killer who murdered at least 23 people between 1989 and 2006. He was known as "The Pillow Killer" because he would suffocate his victims with a pillow. Keller was a master manipulator and a skilled gardener, and he was able to elude capture for several years. He was eventually arrested in 2006 and confessed to his crimes. He was sentenced to life in prison without the possibility of parole.