The Churgeon was a Heretek, who was working with the Logicians in order to experiment with control organ implantation. She had been working in the Coscarla District for approximately 2 standard months before one of her subjects escaped.
The escape of Saul Arbest caused the eyes of the Inquisition to focus on what was going on within the Coscarla District, and a band of Acolytes was sent in to investigate.
Their investigations eventually led to the Alms House that she was using to conduct her experiment, and she was killed during the tail end of the assault. her body has been examined by the Inquisition before being turned over to the Adeptus Mechanicus.