A Form Two student who decomposing body was recovered a fortnight after his disappearance from Don Bosco Secondary School did not commit suicide, autopsy report has revealed.

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There were confusions surrounding the death of Wycliffe Mayieka, who was buried three weeks ago with a purported suicide note recovered from his locker.

Pathologist Dennis Nyabera said the examination showed that the student was hit with a blunt object leading to internal bleeding in his brsin.

“As a result of my examination, I formed an opinion that the cause of death was cardiorespiratory arrest secondary to brain tissue damage due to a closed head injury by a blunt object,” the report read in part.

The doctor also indicated that prior to the death, the victim had suffered a linear fracture to the skull where clotted blood was found.

The boy's father, Robinson Mayieka, has dismissed the claims that his son committed suicide saying the school administration must be held responsible for the death.

"My son was killed in cold blood and all the people who were involved should be held to account," Mayieka said.

County Criminal Investigations officer Monica Ong'ayo has assured the parents that her team of investigators will not leave any stone unturned in the case.

"We are going on with our investigations and soon they will see progress after the DCI and Office of Director of Public Prosecutions have been fully informed about the mater," Ms Ong'ayo said.