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.
Butita - These days we exchange memes with Steve Harvey