Unfortunately, this does mean he's retiring, just that he felt that he doesn't need to listen to witnesses called by Democrats, and that therefor no-one else has to hear their testimony either.  So in the middle of today's hearing he picked up the gavel and left the room, shutting off the microphones while a Democrat Congressman was still speaking.

This was after an earlier altercation in the hearing when Rep. Mike Pence (R-Ind) had acused Amnesty Internation of endangering American troops by calling Guatanamo a 'gulag' and Sensenbrenner had for awhile refused to allow the witness to respond.