Dorothy Lester
Originally a human married to Albert Lester who is also known as Axe Man. She lived and was heavily cared for by the man, though as they aged she developed cancer and eventually passed away. Though Albert was deeply upset by this and found a plant contaminated with the T-Virus. The plant ate the corpse of Dorothy and then it is believed the plant and her body had merged together. From here the plant grew and became known as Dorothy in her afterlife.