An autopsy carried out by government pathologist Titus Ngulungu last week revealed that Mr Okombe died due to internal bleeding after he was stabbed four times on different parts of his body.
The report showed the player had four wounds in the chest, head, back and cheek.
The rugby star will be buried at his home in Emasatsi Village in Khwisero, Kakamega County.
Mr Okoth and Ms Mumbi were among the four suspects who were arrested following the murder.
Two others, Mr Eric Mochache and Mr Vincent Omondi, were dropped from the suspects’ list after police investigations failed to link them to the murder.
Justice Odero directed that the two accused persons appear in court on January 22, 2018 when the hearing will begin.