"We have launched investigations to establish the motive of the murder and who murdered the woman," Maingi said.
"We are following some leads, but we are urging residents to help us with any information they may have," she added.
Residents allege that another old woman was saved by neighbours who heard them and switched on the security lights. The thugs fled.
"We heard people in our grandmother's home. We suspected they wanted to steal her sheep and we came out to check, but we heard them running away," said Bedan Njenga.
"We didn't sleep again. We were shocked to learn about the murder of Mwihaki in the morning," he added.
Sub-county community policing chairman Njoroge Kamande condemned the incident saying the people should watch on each other.
"We wonder how her neighbours couldn't hear her house being broken into. The murderers broke the glasses, and hit several times on the iron sheet before gaining access," he wondered.
Lari Kirenga MCA Josphat Kinyanjui said they will lay a strategy with police, area chief and Nyumba kumi officials to beef up security in the area.
Kinyanjui described the incident as a heartless act done to an old poor woman.
A resident Simon Mwangi said in 2015, another incident was witnessed where a woman was attacked by thugs, raped and her head chopped off in the same village.
Area MP Mburu Kahangara sent a message of condolences to the family urging the police and the DCI to dig deeper into the murder.
The legislator said he has not taken the issue lightly, urging the DCI to investigate the motive of the murder.
"The incident is so ugly, we could not believe it. This is sad. We also heard that there is another old woman who was also a target. We need thorough investigation so as to establish why are these people targeting old women," he told The Star on phone.
The MP also urged the police service to add more police officers at the Escarpment location so that they may help in patrolling the area both during the day and at night.
Police are now earching for the woman's head.
