forward fakekillingcheck(playerid,killerid);
new counting[MAX_PLAYERS];

public OnPlayerDeath(playerid, killerid, reason)
{
        killerid[counting] ++;
        SetTimerEx("fakekillingcheck",30000,0,"i",killerid);
        return 1;
}

public fakekillingcheck(playerid,killerid)
{
	if(killerid[counting] >= 5)
	{
	    // was passieren soll
	}
 	return 1;
}