The Grim Rapper (2020)

The year is 1996. After the East-Coast West-Coast hip-hop war leaves a notorious L.A. gangsta rapper shot dead, the resurrected thug returns as a relentless killing machine, hellbent on revenge! He's "The Grim Rapper", determined to wipe out the posse that did him wrong by executing his targets with his gruesome weapon of choice: a massive skull-laden boom-box that obliterates anyone in its path with deadly beats blasted straight outta Hell! As the bodies pile up, the streets run red and everyday hustlin' turns into a hip-hoppin' horrorshow!

Unfortunately the movie The Grim Rapper is not yet available on HBO Max.