The mother of evangelist Pius Muiru's mother was found murdered on Wednesday.
Her body was buried in a shallow grave at her farm in Karega, Kigumo constituency.
Grace Wangari Mwangi - in her late 70s - was reported missing at the weekend.
Her neighbours mounted a frantic search leading to the discovery of her remains.
"We found a freshly dug area after combing through the farm," a neighbour told the Star.
The family's farmhand was arrested and is helping police with investigations into the murder.
Muiru, the leader of Maximum Miracle ministries, contested the presidency in 2007 through Kenya People's Party.
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