In the new two-part documentary Jimmy Savile: A British Horror Story, debuting April 6, Britain’s most celebrated — and reviled — DJ and TV host is reexamined more than a decade after his death. Savile, who was known for hosting the long-running music show Top of the Pops and BBC’s Jim’ll Fix It, died in 2011 at age 84 before his horrific history of sexual abuse came to light. In the aftermath of his passing, hordes of people came forward claiming that Savile had molested, raped or otherwise abused them. Allegations against Savile indicate that he sexually violated upwards of 400 people over a 54-year span (1955 to 2009), with his victims ranging in age from 5 to 75. Investigators were able to corroborate dozens of stories from Savile’s past, and the nation was shocked, left to grapple with the consequences of a man who was never held accountable in...