A new documentary provides evidence that Tupac Shakur knew the person who killed him.

The Snapped: Notorious Tupac Shakur documentary airing September 10 on Oxygen will also allege that the Las Vegas police never solved the crime because they didn't want to.

Footage seen by TMZ "paints a vivid picture of Pac's last breaths on his deathbed in a Las Vegas hospital ... his finger shot off and nodding that he knew who did this to him."

[Related: Boosie Badazz questions 2Pac's gangsta bona fides.]

The 2 hour doc features interviews with Danny Boy and Yo-Yo, DJ Mister Cee, Pac's first manager Leila Steinberg, music journalist Toure and more.

Check the trailer.