What term refers to a story of a person's life written by another author?

The term that refers to a story of a person's life written by another author is "biography." A biography provides a detailed account of a person's life, including their experiences, achievements, and contributions, as well as the context in which they lived. This form of writing is typically based on research and includes interviews, letters, and other primary sources to present an accurate picture of the subject's life.

In contrast, an autobiography is written by the person themselves, detailing their own life experiences. A memoir focuses on specific events or themes from a person's life rather than their entire life story. "Life story" is a more general term and isn't widely used as a literary genre compared to the other terms mentioned. Therefore, the most accurate and specific answer to the question is biography.