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Dichen Lachman, who plays Ms. Casey/Gemma, is especially proud of this season’s heartbreaking seventh episode, “Chikhai Bardo,” which flashes back to Mark and Gemma’s once-blissful time as husband and wife, their relationship affected by miscarriages and IVF treatments.

In the end, Wainwright has created a latter-day bardo, the spiritual journey that follows death.

In Tibetan Buddhism, the bardo is the transitional state between death and rebirth.

This Wondery podcast, hosted by the former F.B.I. criminal profiler Candice DeLong, who also spent a decade as a psychiatric nurse, examines the case and all the systemic breakdowns that led Bardo straight to Schaeffer.

Among the most unsettling revelations are how Bardo, who since childhood had relentlessly obsessed over and stalked girls and women he knew and didn’t know, acquired a gun and was able to travel to Schaeffer’s home.