Wrigley Co. President Dushan Petrovich will retire at year-end, the Chicago-based confectioner said Monday in a statement.  Petrovich, 57, is a 36-year employee of Wrigley who was named president in 2008 after the company's merger by Mars Inc. Martin Radvan, who is global president of Mars' drinks segment, will be Wrigley's new president.
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