The Apocalypse Now star will executive produce Hard Evidence: O.J. Is Innocent, a six-part series re-investigating the 1995 case, which ended with the acquittal of the American footballer-turned-actor after he was found not guilty of killing Nicole Brown Simpson and Ronald Goldman.

Sheen will narrate the show, largely based on O.J. Is Innocent and I Can Prove It, a book by Texas private investigator William C. Dear, who has spent the past two decades compiling "never-before seen evidence" for an alternative theory that the killer has yet to be caught.

The actor insists the programme will answer three central questions: "What if there were enough evidence that proved O.j. Simpson did not murder his ex-wife Nicole or Ron Goldman? What if the real killer were still at large? And finally, what if a grand jury convened to reconsider the case based on new evidence?".

Simpson is currently behind bars for unrelated offences, including robbery and kidnapping, relating to an incident in Las Vegas in 2007, during which he attempted to recoup memorabilia from his sporting career at gunpoint.

While Hard Evidence: O.J. Is Innocent is slated to premiere on America's Investigation Discovery network in early 2017, the Simpson case recently returned to the headlines thanks to hit TV drama The People v. O.j. Simpson: American Crime Story.

The series debuted in the U.S. in February (16) to impressive ratings and critical acclaim. It features Cuba Gooding, Jr. as Simpson, as well as John Travolta, Sarah Paulson, David Schwimmer, Courtney B. Vance and Nathan Lane in key roles.