He pleaded guilty to federal tax evasion in 2002 as part of a plea agreement on fraud and bribery charges.
Many other defendants have pleaded guilty as part of the drug investigation and are cooperating with prosecutors.
Mr. Esposito pleaded guilty to kidnapping last week as part of an agreement with prosecutors in which he faces 15 years to life in prison.
He originally pleaded not guilty to all charges, later pleading guilty to one charge of persecution as part of a deal.
He was convicted on seven of the charges after pleading guilty as part of a plea-bargain deal.
Caroline pleaded guilty to a lesser charge of manslaughter as part of a plea bargain.
He pleaded guilty to the charges as part of a plea bargain that resulted in the dismissal yesterday of 37 other criminal counts against him.
The men were sentenced for crimes they pleaded guilty to, including racketeering, assault and participation in the killing, as part of their cooperation agreements.
Polanski had pleaded guilty to the charge as part of an agreement.
On August 14, 2007, Smith pleaded guilty to a second-degree manslaughter charge as part of a plea bargain.