DETROIT -- General Motors Co. terminated three U.S. marketing executives as part of this week's management overhaul.


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Cadillac's Steve Shannon and John Howell were dismissed Monday, said eight sources familiar with the moves. Jay Spenchian, an executive director who worked on Cadillac and other brands, was also let go, the sources said. The departures show GM's upheaval ran deeper than the 18 changes cited in the company's press release Tuesday. One of the biggest moves shifted responsibility for U.S. sales to North American President Mark Reuss from Susan Docherty, who remains U.S. marketing chief. Reuss said he made the changes to flatten GM's North American organization, which he said was not moving fast enough to boost sales. Cadillac's 32 percent sales decline in the United States last year was the steepest of any surviving GM brand. Through February, Cadillac's 14 percent increase in 2010 sales lags the gains of Buick, GMC and Chevrolet.

Source: GM dismisses Cadillac managers in overhaul