'Is This The Face Of A Guilty Man?' O.J. Simpson Sings Along To Rap Song About Nicole Brown Simpson's Brutal Murder WATCH The Disturbing Never-Before-Seen Footage

More than twenty years after Nicole Brown Simpson and Ron Goldman’s murders, new details continue to emerge regarding O.J. Simpson’s involvement in the case. And now, RadarOnline.com has learned, a new documentary released last week on the anniversary of the killings has revealed disturbing footage showing Simpson laughing and joking about his ex-wife’s tragic death.

The clip was aired as part of Simpson manager Norman Pardo’s documentary, O.J. Simpson: In His Own Words, and shows a gregarious Simpson chuckling, grooving, and singing along to a never-before-heard-song about the murders.

"On the thirteenth of June, 1994, no one knows what happened on that night for sure,” the song begins, as Simpson bobs his head appreciatively. " . . . In one room ice cream’s melting, candles burning late on the scene was Detective Furman to investigate the murders of Brown and Goldman. Not before long it was on the news, and O.J. Simpson stood accused of murder.”

Though momentarily taken aback by the lyric, Simpson quickly recovered, moving his head along to the melody of the chorus: "In the trial of the century lies a hero’s destiny. Tell me O.J. what’s it gonna be? Every man wants to be free."

"Is this the face of a guilty man?” the song continues. "They say the murder glove don’t even fit his hand.”

And though the lyrics referred to what is surely the most difficult period of Simpson’s life, the months after he lost his ex-wife and was accused of her murder.

The masters of the tacky track have since been destroyed, according to Pardo, and the only trace that remains is this clip.

WATCH the disturbing video :