Named Game of the Year by over 50 publications, Valve's début title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.
This is a military security guard that you can use for your mod and as well as a zombie variant, have fun.
Not too much zombificated, though ;)
Low Def verison?