Being skelital he also has neither brain nor blood. And since both of those are required to be rendered unconscious by a blow to the head I think you mat have failed.
*Thwacks Ness again* The dead do not feel emotion or concern in any way. Therefore, by caring about those using you as a musical instrument, you invalidate your undead state.
Ever heard of Revenants? That's spontaneous undeath.
And besides, I've been murdered - recall it?
I'm undead by sheer will alone. A wandering soul bound [er...] to this plane until I will avenge that heinous crime.