Detailed Explanation
The deaths in Severance are shrouded in mystery by design. Mark's wife Gemma supposedly died in a car crash, but the Season 1 finale reveals she may be alive as the severed wellness counselor Ms. Casey. The show also hints at deaths connected to Lumon's "Macrodata Refinement" work and the mysterious Revolving. What struck me about this show is how it uses the question of who is truly "alive" to explore identity itself—the "innies" are alive but have no existence outside work, while the "outies" have effectively killed their work selves.