Collision and Havok are the same thing -> if what your referring to is the Living Collision that is generated based on the BSBounds shape all creatures lose this when they die.
I used to get confused by this so I started calling the red BSBound thing as 'collision' and the green shapes that takes over after death as 'Havok'. Anyways you get the point

Node Position on Death is usually saved in save games even for nodes without Collision Shapes -> though there is a known issue with dead actors returning to their Bind Pose when you leave an area and return some time later, your probably getting hit by this problem maybe because you do not have even one Collision Shape (which at least one is required to be able to loot the dead creature).
Yes, I don't have any of the green collision shapes. (and yes the corpse is not lootable) ... guess I will have to add Havok after all.
Anyways any ideas on where approximately should I link the collision shape (I intend to add only one).
I remember that once I added one to each of the legs and when the creature died the legs got stretched like chewed gum all over the screen.