The governor said: "I cannot believe a normal human being can do such a thing. I know that the death sentence is unconstitutional, but the government should consider reviewing that decision to ensure people who committed this kind of offences are hanged."
Ms Kihika called the police to speed up investigations are arrest anyone who may have been involved in the killing.
"The police have arrested one suspect. Let them interrogate him properly so he can reveal his accomplices," the governor said.
She called on residents who may know the assailants to reveal them and warned the parents whose children were responsible the offence against hiding them.
"If parents are hiding their children knowing they did such an act, then it is very wrong. They should report them to the police," she said.
Kihika further said those who killed Njoki may be victims of drug abuse and illicit brew usage. She promised that the county would step up the fight against illicit brew and drug abuse.
Gilgil MP Martha Wangari said: "Those who committed the offence are not humans but wild animals and should be treated as such when they are apprehended."
"I want to warn criminals that your days are numbered. The police, indeed and the whole government, would not rest until they are arrested, charged and jailed," Kihika said.
Gilgil MP Martha Wangari said: "Those who committed the offence are not humans but wild animals and should be treated as such when they are apprehended."
She called on residents to report such incidents as she condemned crime in the area.
The MP called on the administration of the village to clear the thicket that has been as a hideout for dangerous criminals.
"We hope that every individual in this area will take their responsibilities to ensure security is improved," said Wangari.
Naivasha East MCA Stanley Karanja condemned the police for not moving with speed to apprehend Njoki's killers.
"If Njoki was from a rich family, the police would have arrested all the suspects by now," he said.
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