MonoBehaviour.OnPlayerDisconnected  

function OnPlayerDisconnected(player : NetworkPlayer) {
Debug.Log("Clean up after player " + player);
Network.RemoveRPCs(player);
Network.DestroyPlayerObjects(player);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void OnPlayerDisconnected(NetworkPlayer player) {
Debug.Log("Clean up after player " + player);
Network.RemoveRPCs(player);
Network.DestroyPlayerObjects(player);
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def OnPlayerDisconnected(player as NetworkPlayer):
Debug.Log(('Clean up after player ' + player))
Network.RemoveRPCs(player)
Network.DestroyPlayerObjects(player)