Who is the most famous non-graduate of Richardson high school in Texas?

Determining the single "most famous" person is subjective and depends on the criteria used (e.g., global recognition, impact in a specific field, etc.). There isn't a definitive ranking. However, a strong contender for the most famous non-graduate of Richardson High School in Texas would likely be an athlete or entertainer who may have attended the school briefly or transferred before graduation. Public information on such individuals is limited, making a conclusive answer impossible without extensive research.