A psychologist and former prosecutor who serves as the series protagonist. She assists in the hospital murder investigation using her psychological insight and investigative skills, ultimately becoming a target herself.
Grant's presence at the hospital and potential conflicts place him on the suspect list.
Sabrina is questioned as her hospital records and interactions align with early crime scenes.
Hailey identifies Jonas as the central figure in the murder pattern due to his access and motives.
Detective Montgomery shares police evidence and coordinates field operations with Hailey.
D.A. D'Orazio provides legal boundaries and prosecutorial guidance during the murder probe.
Hailey knows Meghan through Fincher and the hospital network, initially viewing her as a suspect.
Hailey actively assists Fincher in tracking the hospital murders using her psychological expertise.