А так?
Код
public Action:EntityKilled(Handle:event, const String:name[], bool:dontBroadcast)
{
new entindex_killed = GetClientOfUserId(GetEventInt(event, "entindex_killed")),
attacker = GetClientOfUserId(GetEventInt(event, "entindex_attacker"));
if (entindex_killed > 0 && attacker > 0)
{
PrintToChat(entindex_killed, "\x01 Убил = %N!", attacker);
}
}