On Episode 23: Hell's Kitchen Kelsey tells Sierra all about the horrific crime that Katherine Mary Knight committed and the behavior that led her down a dark path of domestic destruction. Sources:Deadly Women Season 1 Episode 3: Revengehttps://en.wikipedia.org/wiki/Katherine_KnightVhttps://www.nydailynews.com/news/justice-story/aussie-woman-removed-beau-skin-article-1.1476480