Same thing happened to me tonight on UK22, me and a friend noticed a guy called janson on the roof of the firestation. My friend sniped him and killed him and we ran over to head up the ladders, as we got to the top i noticed there was another person on the top of the roof where we had killed Janson. I come up the ladder and unload my m4 into him, msg pops up Janson has been killed (again like you friendly fire msg) i start looting him and his body drops thru the floor and vanish's, 2-3 seconds later he respawns again. So we kill him again and go down the ladders to log out, can't get awya from this area with someone insta respawning with full gear. He had all the good stuff you would expect anyone cheating to have, happened on Uk 22 around 2am my user is alan and my friend was darren.