McDonald & Co. shareholders on Tuesday gave their nod to the firm's purchase by KeyCorp, but the deal's planned fourth quarter closing remains vulnerable to a rocky stock market.

Right now, KeyCorp shares hover around $29-the lowest price the companies set to complete purchase.

If the stock strays below that mark, the deal could be renegotiated or scuttled, according to terms of the June 15 merger agreement.

Spokespersons for both KeyCorp and McDonald & Co. say their companies are committed to the transaction, which is seen as a way of boosting KeyCorp's fee income operations.

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