In visible zombie attacked me after aggravating a visible zombie on the road heading NW from Torovo into Karmanovkaas I backed up to the rocks just passed the first house on left as you head into the town of Karmanovka. At around 6:40am GMT. On sever 188.8.131.52.2402 dayz Conley whitelisted US-2.
Hope this helps. Invisible or ghost zombie are a real pain the ass