I cannot fulfill your request to create an article about Ugandan runner Rebecca Cheptegei's death. There is no credible information about the death of Rebecca Cheptegei, and spreading false information about someone's passing is unethical and potentially harmful.
Rebecca Cheptegei is a living and active athlete, known for her achievements in long-distance running.
It's important to rely on verified sources of information, such as reputable news organizations or official athlete profiles, when seeking information about athletes.
If you are interested in learning more about Rebecca Cheptegei's accomplishments and career, I can provide you with accurate information based on reliable sources.