Brittany Murphy is listed and she passed away on December 20, 2009 so it's very unusual that Michael is not listed if he has passed and is interned there...
Burial Site Locator
Interment Results:
Records: 1 - 1 Page: 1 of 1
Name: Murphy-Monjack, Brittany Anne
Date of Death: 12/20/2009
Park: Hollywood Hills
Just like it's unusual that he's still not on TMZ's rip-list...
But why are Joe and Katherine listed?
Maybe they reserved tombs there