"I was slashed with a machete. The way my hands are now, most of my plans are ruined. I was doing manual work like farming, weaving mats and such. Now this is my situation," he says.
"I know the person who cut my hands but we have never met face to face since. He cut me because of alleged witchcraft... He claimed that I killed his child. I don't have anything to do with witchcraft. Honestly, I have one piece of land at the seafront. My land is six acres."
He says he would love to go back to his home permanently, but that would almost certainly be a death sentence. He takes the BBC team home. He has only been back there once since the attack and can only go there with Julius from Haki Yetu as protection.
His youngest son appears and cries bitterly when he sees his father and the condition he is in. Katana shows the team where he was attacked, in his bedroom.
"That day... I sat there and continued to weave. Soon after, I realized the door was open and pangas were drawn. This hand was immediately cut and it fell on the floor.... I called out to my wife, telling her I was being cut. She said, 'I am helpless'. He continued to cut me while I was screaming. Eventually, people came and helped me. Then I lost consciousness," he says.
Julius has been pushing for justice for Katana but there have been no arrests. He says that very few people have been charged with allegations of the killing of the elderly, which is why the killers do it freely.
"I went with one of the police officers to the ground to collect a body and he told me, 'Julius no no, let them kill each other. My work here is to collect the bodies'. The police are the weakest link in this whole process. In most of the police stations, some of them can't even tell you how many people have been killed," says Julius.
Njeri speaks to a man who has been contracted before to conduct the killings. He has killed 20 people and explains that whenever he is asked to do it, it is always a request by family members. He is paid a minimum of Sh50,000 to do it.
He claims that he has stopped doing it out of guilt, but when asked how he feels about having given someone a death sentence, he says, "No it is not I who gave it. I may have done something bad because I was given the job and killed. But according to the law, according to God, the person who sent me is the guilty one."
Elderly victims repeatedly complained of police inaction.