Sir Headless Nick Half Blood Prince?

[Anna]

No: HPFGUIDX 128158


Anna: 
I was just wondering if anyone thinks the HBP is Sir Headless Nick. 
I am listening to OotP and he just stated right after the Sorting 
of the 1st years that he has noble blood running though his veins. 
And then Ron laughed at him? Any thoughts, anyone? I am just 
wondering what others think. Sorry I can't reference it to the book, 'cause my books are packed. 

Anna