Singer spent years as a seemingly devout nun in a Bavarian convent. After a sister became possessed by demons, priests found poisons and demonic robes in Singers room. She confessed to being a witch sent to infiltrate the convent during questioning.
Other Information:
Singer's favorite poison was Aqua Tofana, composed mostly of arsenic and lead.
After her execution, intellectuals began casting doubt on witch trial's and the logic often used.