Lambda the Ultimate

Apparently he was also a wikinews contributor as they have an obituary: Wikinews mourns loss of volunteer John Shutt

On Friday, Wikinews learned Dr John Nathan Shutt, a long-time contributor to both Wikinews and Wikibooks, died on Wednesday. Editing under the name Pi zero, he was at the time the top contributor to Wikinews by edit count, and came third on English Wikibooks. Dr Shutt was 56 years old.

Edit: John's post tracking page