Our bodies are taking away lives of micro organism by antibodies. Cutting and preparing vegetable and salad is killing. Murder is the taking away of life illegally. The final judge of all creation, God, has the last say on what is just and what is legal. So, God decides on what is murder and what is not.
Murder is the undeserved removal of life.
God gives and God takes. God simply take back what orginally and always belong to Him. He freely gives His life for the redemption of mankind. God seeing nobody to save Himself from giving His human life at the crucifixion, saved Himself by His own hand. When death occurs quickly, it is a violent act.