HARTFORD (AP) — A former executive of the insurance giant American International Group was sentenced to four years in prison Tuesday in a fraud case that authorities say cost shareholders more than $500 million.

The executive, Christian Milton of Wynnewood, Pa., was sentenced by Judge Christopher F. Droney of Federal District Court in Hartford. He was also fined $200,000.

Mr. Milton declined to speak during the hearing but his lawyers said they were preparing an appeal.

He was ordered to report to the federal Bureau of Prisons on March 25.

Mr. Milton, 61, A.I.G.’s vice president for reinsurance from 1982 to 2005, was convicted last year of conspiracy, securities fraud, mail fraud and making false statements to the Securities and Exchange Commission.

The investigation also led to the convictions of four executives of General Re last year for their roles in manipulating A.I.G.’s financial statements.