In the 2nd version (the official one), it mostly Shafi Hadi soloing although there is still Mingus soloing quite a bit
The ordinal version with all the Mingus tunes barely exists and is not allowed by the Cassevetes estate.
That's what I read anyway.
TCM streaming (via the HBO Max app) has the entire film. It's still a jolting watch, and the murder/aftermath is just, like, the last quarter or so.