4.11A: Izchak Miller, one of the founding members of the DevTeam, passed away on April 1, 1994 from complications due to cancer. As he was responsible for, among other things, much of the shopkeeper logic, the owner of the lighting shop was named for him as a tribute. The DevTeam dedicated version 3.2 of NetHack to the memory of Izchak Miller. Many players who will happily slay everything else that moves will spare Izchak's life as a sign of respect.
For a little more info, including a post from Izchak's daughter, check out the following thread from 1996 in rgrn: http://groups.google.com/groups?hl=en&lr=&safe=off&ic=1&th=714fda729e8182a7
-from rec.games.roguelike.nethack FAQ
Thanks to professorbooty for today's entry.