It was gathered that the police searched his house and discovered some charms he had tied on baby dolls, which they removed and brought to the police station as exhibits.
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'Githeri Man' became famous after the August 8 election when a photograph of him eating githeri as he queued to vote, surfaced online.
The police boss said the suspect would be charged to court for culpable homicide.
Some arrests have been made and the suspects have offered useful information to their investigations.
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An eyewitness and a friend of the deceased, Kingsley Adjei, indicated that Amos was well known in the community