Louis Theroux is to make a new BBC film about sex offender Jimmy Savile, 15 years after his acclaimed documentary about the disgraced presenter, When Louis Met Jimmy, first aired on BBC Two.
Theroux spent three months filming Savile in 1999 for the original programme and questioned him about longstanding rumours that he was a paedophile, with the former Jim'll Fix It host dismissing the allegations.
After the film, Theroux and Savile stayed in contact until 2004.
Now, following the revelations about Savile's crimes that have emerged since his death in 2011, Theroux will meet survivors of his abuse, members of his family and former colleagues to try to understand how he escaped justice for so long.
Kim Shillinglaw, Controller of BBC Two and BBC Four, described the new documentary as important and deeply personal for the BBC.
The Savile scandal was finally exposed in the October 2012 ITV documentary The Other Side of Jimmy Savile.
The full extent of his crimes was then revealed in the report which followed the Metropolitan Police Service investigation Operation Yewtree.
It found that Savile had committed 214 sex crimes, with a Department of Health report in the UK also finding that he committed sex attacks at 28 NHS hospitals.
The commissioning of the new documentary about Savile follows comments Theroux made on comedian Richard Herring's Leicester Square Theatre podcast last July.
"I have grappled with, as someone who made a documentary about him, spent 10 days with him and failed to reveal the fact that he was one of the most prolific sex offenders of modern times possibly," said Theroux.
"I feel a sense of responsibility. I'm trying to go back and figure out how did I miss that?"