Goodbye Fergus: [s12e4]

Sam helps Magda realize she isn't evil. However, after she is sent away for her safety, she is assassinated by Mr. Ketch of the British Men of Letters.

Dean struggles with his mother Mary’s decision to leave and take some space for herself. "Supernatural" American Nightmare (TV Episode 2016) - IMDb [S12E4] Goodbye Fergus

In this episode, Sam and Dean investigate a series of mysterious deaths involving in Iowa. Sam helps Magda realize she isn't evil

The brothers encounter the Petersons, a devout religious family living off the grid. [S12E4] Goodbye Fergus