Did a San Francisco Police Officer Shoot a Handcuffed Man Dead?

This morning, a 30-year-old Cambodian man who works at a San Francisco chocolate factory stabbed a fellow employee in the arm with a box cutter the fled. Police responding to the stabbing pursued the suspect several blocks before finally cornering him. According to the SFPD, "a female officer ordered the man to stop and drop the weapon, but the man instead lunged at her with the box cutter and was stopped by two bullets in the chest at close range." (Other reports say he was shot in the torso.) The man fell to the ground and officers handcuffed. When they turned him over they saw he'd been hit, so they removed the handcuffs and began CPR. Sounds suspect. If the officer "stopped" him by putting two bullets into his chest/torso at "close range" why are they surprised that he was hit. Eyewitnesses have a different story. At least two citizens say the man was shot while handcuffed. He was taken to a local hospital where he was pronounced dead. (The stabbing victim was treated the hospital and released. It's unclear what prompted the stab-ation.)