Schizo

A British psychological horror slasher film, "Schizo" (1976) follows Samantha Gray, a famous figure skater (Lynne Frederick), as she suspects that someone close to her is a psychopath responsible for a series of murders in London. The investigation leads Samantha to confront an ex-convict who claims she has a split personality and was wrongfully convicted, forcing her to face the possibility that she herself may be a murderer.