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I thought at firts this was some admin prank , but ....
PLz ban him pernamently
http://cloud-2.steampowered.com/ugc/1101392822542890724/AFB61E49BA674E3BA1C3C47AC2978FB52ECDD457/
Replies

You sure? Because sometimes the game bugs and will not show some models of some players, AFAIK there's no hacks that renders the player invisible.

For your reference:
forums.steampowered.com/forums/showthread.php?t=2607070

and from http://forums.steampowered.com/forums/showthread.php?t=1184172
"Visual Glitch Fix:
This is for glitches like the after round crits staying or invisible players. In console, type record fix; stop This will record a demo under the name fix and then stop it. Usually for me, I have to do it twice to get things to work. You also bind this for easy access.
*Also fixes the invisible player glitch. The demo requests a full update fixing such things*"

Besides please report via the menu function, otherwise we will not be able to handle your report, unless you can provide solid evidence of the player cheating or hacking.

In the future please use the ingame menu (by typing 'menu' in chat) to report cheaters.