In the documentary "Richard Pryor: Omit the Logic", exactly 2 minutes before the credits start, there is a slow, calm instrumental that plays over an image of a newspaper with the news of Pryor's death.
It is when the documentary is about to end and it talks about Richard Pryor´s death. The song continues through a GENIUS piece of monologue.
I already tried to find it looking through the songs which are enumerated at the credits. And also with Shazam, but no luck.