"Adrianne Purity Knight" (also referred to as "Purity Marie Knight") was the main subject of the Slipknot song Purity. Corey Taylor first thought that her murder story was real, but the author of her story claimed it was fictional.
"Adrianne" was supposedly 20 years old when she was kidnapped by an obsessive ex-lover, put in a box, and buried alive.
Due to controversy over the story about Adrianne's murder (it was fictional; Adrianne never even existed), the track Purity had to be removed from the album.
her story can be read here