A Jazz Canadair CRJ-900, registration C-FJJZ performing positioning flight QK-7121 from Sacramento,CA (USA) to Vancouver,BC (Canada) with 4 crew, was climbing out of Sacramento's runway 35R when the crew stopped the climb at 15,000 feet due to the failure of the left hand engine (CF34) and shut the engine down. The aircraft returned to Sacramento for a safe landing on runway 35L about 43 minutes after departure.