Jumaisi had sensationally claimed that he was subjected to torture leading him to confess to the alleged murders during a hearing at the Makadara Law Courts last month.
Through his advocate John Ndegwa, Collins Jumaisi said his alien to the allegations levelled against him by the detectives.
He said at the time of his arrest he was treated inhumanly and he would require urgent medical care.
He made the remarks during a court session where police were seeking orders to detain him for 30 days pending further probe into the macabre killings.
"Nothing concrete has been produced before this court in respect to the accusations levelled against my client. Much of what has been adduced is mere speculation," said Ndegwa.
Makadara magistrate Irene Gicobi, however, allowed the DCI to detain the suspect for 30 days.
According to police, the suspect had confessed to the serial killings.
The DCI said the suspect was trailed to a house in Kayole where officials said he was again trying to lure a victim.
Sources said a raid on the suspect’s house led to the recovery of ten mobile phones, seven identity cards, ten sim cards, a panga, gloves, and several sacks similar to those found with bodies at the dump site and ropes.
“We believe we have a key and prime suspect in the murder of people whose bodies have been found dumped in the Kware area,” said one officer aware of the issue.
The detectives from DCI headquarters in the operation also trailed money withdrawn from the latest victims of the murder.
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