The Wolfenstein Death Match Multiplayer was a multiplayer mod project, made by Jay in collaboration with Parafriction. Mentioned on the Wolfenstein 3D Dome news on February 6, 2001 the following was posted in connection with its progress:
Almost all gameplay aspects are finished - walking, turning, running, opening doors & secrets, shooting, frag counting, dying and respawning - all work simultaneously for 2 players (only picking up items & random spawn spots are left to do). The graphics and sprites are also finished, and the levels are almost completed.
Due to a source code issue, the mod was delayed but by February 2001 it looked as if it might see the light of day. Sadly this was not to be, as no further news were heard on the project since.
Multiplayer Wolfenstein 3D had been discussed numerous time before and after this project, though. Its initial ideas still live on in more recent projects such as SplitWolf.