First USA Paymentech Inc. announced the resignation Wednesday of its chief financial officer and a restatement of its fourth- and first-quarter earnings.

The Dallas company, a unit of Banc One Corp., said the two events were unrelated. Columbus, Ohio-based Banc One acquired the unit when it bought First USA Inc.

Paymentech's stock plummeted $5.87 a share in heavy trading, closing at $16.37, a 26.4% drop from Tuesday's closing price of $22.25.

David W. Truetzel, 40, the former Paymentech chief financial officer, cited family reasons for his departure. He had been with the company for two years.

Paymentech said it had restated its fiscal 1997 fourth-quarter earnings to reflect a loss of 25 cents a share and said it would fall short of analysts' earnings consensus of 22 cents a share for its first fiscal quarter, ending Sept. 30.

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