Anthony Marshall, 90, whose life as philanthropist Brooke Astor's only child unraveled as he was convicted of raiding her fortune, died Sunday in New York City, his lawyer said Monday.

Attorney Kenneth Warner did not immediately have information on the cause of Mr. Marshall's death, but the 90-year-old had had heart and other health problems for years.

Mr. Marshall, a decorated World War II veteran who became a diplomat and Broadway producer, was convicted in October 2009 of taking advantage of his aged mother's slipping mind to loot her millions, and was sentenced to one to three years in prison. His incarceration was delayed for more than 31/2 years as he appealed, and he went to prison in June 2013.

He was granted medical parole two months later, with a state board finding that he was suffering from debilitating and permanent, though not terminal, illness. The board asked whether he had regrets about the events leading to his imprisonment, according to a transcript. - AP