Agnes Tirop was found dead in her house in Iten, Elgeyo Marakwet County.
Her body had a stab wound on the neck.
Tirop has been living at an athletics camp after differing with her husband but returned two days ago at the home following reconciliation by relatives and friends.
Athletics Kenya eulogised her as a jewel who was one of the fastest rising athletics giant on the international stage.
Last month, she broke the women-only recoed in women’s 10km at Road to Records race in Germany with a timing of 30:01