A teenage girl was on Sunday stabbed to death at Huho-ini village, Ol Kalou by an unknown assailant.
She suffered deep stab wounds in the neck, head and stomach.
The girl who was identified as Lucy Wanjiku, 16, also had cuts in her hands.
The form two student at St Theresa Secondary school, Manunga, Kipipiri had gone to Huho-ini to visit her grandparents two days ago.
Shock in Bomet as 4 are arrested for gang raping a student ,recording the harrowing ordeal and sharing it on social media
Her grandfather Frank Mwangi said a stranger had been seen around his home asking if he and his wife were at home.
The grandparents want a thorough investigation into the gruesome murder.
Area chief Daniel Muniu said an investigation has been launched to find the killer.
Elsewhere, four KCSE candidates have been deregistered by the examination council and discontinued from sitting the exam on charges of cheating.
Education CS Amina Mohamed said the candidates were caught with “foreign material and documentation” in examination rooms ahead of Mathematics Paper 2.
Three cases were reported in Garissa while the other was reported in Nairobi.
“We took away the materials before the exam. We have deregistered the affected students. They will not be allowed to continue with the exams because we actually feel that they committed an omission,” Amina said.
She spoke in Naivasha Town on Monday where she opened the examination container and conducted impromptu visits in selected schools.
In a tweet, the CS confirmed that 40 teachers will also face disciplinary action over examination irregularities.
She did not disclose the identity of the candidates or their schools but said details will be released later.
“There may be a few more, we are still scrutinising some of the equipment that we have confiscated from the students and if we feel that additional students need to be deregistered, we will do that,” she said.
“We will also take action against centre managers who do not do what they are expected to,” Amina added.
This year’s exams have been touted as “militarised”, going by the number of police officers that have been deployed to man them.
Strict measures have also been put in place to guard against leakage by ensuring papers are locked up in secured containers at a central collection point.
School heads accompanied by armed police officers pick up the papers simultaneously at 6am before being escorted back to their respective centres.
Amina reminded the centre managers to ensure candidates are thoroughly frisked to ensure illegal elements are not sneaked into exam rooms.
“It doesn’t matter how many times a candidate leaves the exam room. Every time the candidate comes back he needs to be fully frisked,” she said.