The body of a 15-year-old girl was found dumped in a church in Migori County.
A village elder said Sheril Dorin had been living with her aunt for three days before she was killed.
Reports by the Standard indicated that the Form One student at Siro Girls Secondary School was half-naked and had a swollen neck.
Her aunt, Betty Odhiambo, said she had left the girl in the house with her two children overnight only to return in the morning and find that she was missing.
Phebby Anyango, the grandmother, said Dorin had left their home in Kanyamkago village in Uriri Sub-county on Saturday.
Rape cases Kenya
She passed by her home in Oruba village in Suna West before going to stay with Odhiambo.
Kenyan authorities and aid agencies say rape and sexual abuse cases against girls have increased since the start of the pandemic.
Some safe shelters in Nairobi are overwhelmed by girls who need an escape from people meant to care for them.
Children have extra time of these days since schools closed in March because of the coronavirus pandemic making them more vulnerable to sexual predators.
The Ministry of Health said it received reports of at least 5,000 sexual violence cases across the country, 65% of them involve girls younger than 18.