Police investigating the gruesome murder of 9-year-old Maribel Kapolon in Meru have narrowed down to a man jilted by the girl's mother.

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Her mother is Githongo law court senior resident magistrate Caroline Kemei.

The man has been arrested and is being grilled.

A police report indicates the girl was called by someone who identified her by name immediately she was dropped by her school bus.

She told her two friends that the stranger was her uncle and rushed to him.

The man then led her into a car that was parked around the Total petrol station.

Her decomposing body was to later be found at Upper Imenti Forest on Sunday.

She was a Standard Four pupil at Consolata Primary in Meru.