At 11:30 central time, a Cessna 340B suffered a collapsed right main landing gear during a single-engine landing at Lancaster. The pilot suffered minor injuries. The pilot said he was descending for landing and switched tanks and reduced power. The right engine quit. He tried to restart the engine but failed, so he feathered the prop. Within two minutes, the left engine quit. The pilot was able to restore power to both engines, but the right engine did not run smoothly. About seven miles from the airport the right engine quit again and the pilot again feathered the prop. When the pilot completed the before-landing checklist while on final, he noted the gear warning lights did not show all three gear were down and locked.