Madoff Behind Bars

"I always knew this day would come." CnnMoney.com reports Bernie Madoff as saying in front of U.S. District Judge Denny Chin. Madoff was in court today to plead guilty to criminal charges related to his Ponzi scheme. Judge Chin remanded him to jail, and set his sentencing hearing for June 16. Madoff faces up to 150 years in prison.
The article reports that some investors believe that Madoff was not the only one involved in the scheme though. They think his family was involved as well. Could Madoff have done it alone? I would like to hear your thoughts on whether or not he could have done it by himself.