What Little Niggling Details will be left?

[Eddie]

No: HPFGUIDX 171104

> Siriusly Snapey Susan (cubfanbudwoman):
> Just what do you all believe will 
> go UNANSWERED from among those things which are driving you nuts?

Eddie:
I want to know what would happen to a ghost who passed through the
"Veil of Death" (at the MoM) that killed Sirius.  Suppose
Nearly-Headless Nick got tired of his current nearly-headless
existence and decided to end it all.  Could he this way?  For
reference, he might actually want to.  It has been 500 years after all:

Quote from OOTP, Chapter 38 The Second War Begins:
'I was afraid of death,' said Nick softly. 'I chose to remain behind.
I sometimes wonder whether I oughtn't to have
 well, that is neither
here nor there
 in fact, I am neither here nor there
' He gave a small
sad chuckle."

The only way I can imagine that the divine Ms. R would actually answer
my question is if it were an integral part of the Deathly Hallows
plot.  Could he carry a horcrux with him?

Or could he return?  Perhaps he could be a message carrier?

Eddie