It was the latest horrific incident of gender-based violence in the East African country, where activists have warned of a femicide epidemic.
The 33-year-old long distance runner died at about 5:30 am (04:30 SA time), the doctor treating her at a hospital in Eldoret in western Kenya told reporters.
"Her injuries were extensive and covered most parts of her body. It led to multiple organ failure," said Kimani Mbugua, head of the intensive care unit at the Moi Teaching and Referral Hospital.
"We tried our best but we did not succeed. Looking at her age and the over 80 percent burns she suffered, the hope of recovery was slim."
According to police, a man identified as Cheptegei's partner, Dickson Ndiema Marangach, doused her with petrol and set her alight on Sunday at her home in Endebess in the western county of Trans-Nzoia.
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