Episode 2 covers the Katherine Knight case

Sources

https://allthatsinteresting.com/katherine-knight

https://murderpedia.org/female.K/k/knight-katherine.htm

https://www.news.com.au/lifestyle/real-life/true-stories/cops-horrific-discovery-inside-wa-home-still-haunts-them/news-story/73553ade114298cf8bfda4730d845e5b