The six-episode series premieres in January on Investigation Discovery
All Crops: 51967322 Collection: AFP LOS ANGELES, CA - DECEMBER 8: O. J. Simpson sits in Superior Court in Los Angeles 08 December 1994
Credit: POOL/AFP/Getty Images

More than two decades after O.J. Simpson was acquitted of murdering his wife Nicole Brown Simpson and her friend Ronald Goldman, the case still captivates crime watchers.

Although the former football star was found not guilty, a jury found him civilly responsible for the victims’ wrongful death. He was ordered to pay $33.5 million to surviving family members.

A new docuseries advances the theories that Simpson, now 69, might not have committed the murders or that he had help carrying them out.

Investigation Discovery’s six-part series, Is O.J. Innocent? The Missing Evidence, explores new theories and never-before-seen evidence in the high-profile case.

In a promo seen here, the show alleges that the blood evidence is inconsistent with the theory that Simpson acting alone. Among other evidence, the series raises the possibility that there were two sets of bloody footprints and blood in the passenger seat of Simpson’s infamous white Ford Bronco.

Additionally, one expert displays a knife he believes was used in the murders. Despite numerous searches, investigators have never been able to find the murder weapon.

Is OJ Innocent? The Missing Evidence premieres on January 15 at 9 p.m. EST on Investigation Discovery.