The 33-year-old Ugandan marathon runner, who competed in the recent Paris Olympics, had suffered extensive burns after Sunday's attack.
The authorities in north-west Kenya, where Cheptegei lived and trained, said she was targeted after returning home from church with her two daughters.
Her father, Joseph Cheptegei, said that he had lost a “very supportive” daughter. Fellow Ugandan athlete James Kirwa told the BBC about her generosity and how she had helped out other runners financially.
A report filed by a local administrator alleged the athlete and her ex-partner had been wrangling over a piece of land. Police say an investigation is under way.
Cheptegei, from a region just across the border in Uganda, is said to have bought a plot in Trans Nzoia county and built a house to be near Kenya's elite athletics training centres.
Attacks on women have become a major concern in Kenya. In 2022 at least 34% of women said they had experienced physical violence, according to a national survey.
"This tragedy is a stark reminder of the urgent need to combat gender-based violence, which has increasingly affected even elite sports," Kenya's Sports Minister Kipchumba Murkomen said.
Ugandan runner Rebecca Cheptegei: Olympic athlete dies days after being set alight by ex-boyfriend
Marathon runner Rebecca Cheptegei, 33, was doused in petrol after returning home from church.
www.bbc.com