Chief Inspector of Police Sabina Kerubo, in whose house journalist Eric Oloo was found dead in Ugunja, Siaya County, has been arrested.
Ms Kerubo was found drinking in a chang'aa den.
The body of the 40-year-old journalist was found soaked in blood in a bed in the inspector's house on Thursday morning.
Ms Kerubo is said to have been cohabiting with Mr Oloo, who had been working at The Star.
Ugunja sub-county police commander Ibrahim Muchuma said the body was taken to Ambira sub-county hospital mortuary but did not give details.
"The issue is sensitive so we can't comment further. Kindly talk to my boss in Siaya," he said.
Siaya County police commander Francis Kooli told the Nation that the journalist and the policewoman were in a love affair, but did not elaborate.
A police officer, who sought anonymity for lack of authority to speak to the media, said Mr Oloo was in the house with two other men on Wednesday night.
A scuffle ensued while they were there, he added. Police arrested one of the men and took him to Ugunja for questioning.
Mr Oloo's mother, Keziah Oloo, and cousin Crispin Odhiambo said on Thursday that he had been living with the officer since 2018.
So far, detectives have questioned the officer's house-help to establish whether the chief inspector was at home.
She recorded her statement at Ugunja Police Station.