On Thu, Oct 11, 2012 at 11:23 AM, Dave L. Renfro <renfr1dl@cmich.edu> wrote:
A few minutes ago I learned that Jonathan Groves died on
4 June 2011 at the age of 29.

I learned this from this Editor's Note at the end of

Jonathan Groves, "An elementary counterexample in the
compact-open topology", American Mathematical Monthly
119 #8 (October 2012), 693-694.

Thank you for letting us know. 

Yes, he has been an active and intelligent participant in many threads here.

Here's a post I consider representative of his many thoughtful contributions: