WHAT’S become of the prestigious Knickerbocker Club? While the jury is out on Anthony D. Marshall and Francis X. Morrissey Jr. — on trial for forgery, fraud and conspiracy in the Brooke Astor case — fellow member Carlos J. Spinelli-Noseda, a former partner at Sullivan & Cromwell, resigned from the bar after billing clients for more than $500,000 in allegedly fraudulent expenses. Member Walter M. Noel Jr. of the Fairfield Greenwich Group is accused of fraud in connection with the Madoff scheme. And member Finn M.W. Casperson blew his brains out on Labor Day in Rhode Island as the IRS was closing in on his offshore bank accounts. Who’s next?