Chemical Banking Corp. and Bank of New York Co. are making 11th-hour bids to unseat U.S. Trust Corp. as executor of the $1.2 billion estate of tobacco heiress Doris Duke.

Both Chemical and Bank of New York are raising legal objections to the late Ms. Duke's April 1993 will, which named U.S. Trust and Ms. Duke's former butler, Bernard Lafferty, as co-executors. Chemical and Bank of New York had been named as co-executors separately in earlier versions of Ms. Duke's will.

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