Admin - /kill command

CMD:kill(playerid, params[])
{
    new giveplayerid, string[128];
    if(!IsAdmin(playerid)) return UnAuth(playerid);
    if(sscanf(params, "u", giveplayerid)) return Syntax(playerid, "kill" "[playerid]");
    format(string, sizeof(string), "You were killed by administrator %s", GetPlayerNameEx(playerid));
    SendClientMessageEx(giveplayerid, COLOR_WHITE, string);
    format(string, sizeof(string), "You just killed %s", GetPlayerNameEx(giveplayerid));
    SendClientMessageEx(playerid, COLOR_LIGHTBLUE, string);
    SetPlayerHealth(giveplayerid, 0);
    return 1;
}