EDITOR'S NOTE: An earlier version of this story incorrectly said Ed Peper, Cadillac's general sales manager, was demoted. Peper will likely get a new title while performing similar duties, GM says.
DETROIT -- General Motors Co. terminated three U.S. marketing executives as part of this week's management overhaul.
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.
On Tuesday, GM also moved Bryan Nesbitt back to design after seven months as Cadillac's chief. Instead of one boss, each of GM's surviving U.S. brands -- Cadillac, Chevrolet and Buick-GMC -- now has one leader for sales and service and another for marketing.
Ed Peper, Cadillac's general sales manager since July, will report to Kurt McNeil, named Tuesday as Cadillac's head of sales and service.
“The titles are not fully determined for the new structure,” said GM spokesman Chris Preuss. “Ed will have a similar role that he had before.”