DETROIT -- General Motors on Sunday said it will soon halt production of its Pontiac Bonneville -- an enduring name on the U.S. car market -- due to declining sales, according to a Reuters report. Rick Crooks, a spokesman for GM's Pontiac division, said production would end in June of the full-sized car that took its name from Utah's famed salt flats. GM employees were informed of the car's imminent demise in an internal announcement made last week, Crooks said. "It's a declining large-car market and Pontiac is trying to realign its (product) portfolio to where the market is," Crooks told Reuters. He declined to comment when asked if the Bonneville name, which has been used in Pontiac car lineup since 1958, would be revived for some future vehicle.