The hacker left, I talked with Darkivan and he will try to record him next time he joins. Appareantly, the hacker changed name into other players in the server. Went through server (chat) logs, but found nothing that could bring me any closer to the suspected hacker.

Marking Need Evidence.
 
Hacker rejoined the server:
Code:
#    309 "Fisherman "        STEAM_0:0:56558408  38:16      138    0 active
#    304 "Fisherman"        STEAM_0:0:51531316  43:55      72    0 active
#    309 "Beladys | girlpower (NOR)" STEAM_0:0:56558408 39:06  132    0 active
#    223 "Beladys | girlpower (NOR)" STEAM_0:1:50896314  2:49:31  81    0 active
#    309 "undeadchip "      STEAM_0:0:56558408  40:04      179    0 active
#    296 "undeadchip"        STEAM_0:0:31941624  1:03:50    70    0 active
http://www.skial.com/sourcebans/index.php?p=banlist&searchText=STEAM_0:0:56558408&Submit=