Principal Secretary Lillian Mbogo Omollo has been rushed to the Kenyatta National Hospital (KNH) after falling sick behind bars.
Those who were around her when she suddenly fell sick say that her body started shaking and she complained about being in pain.
Prison doctors attended to her and recommended that she be rushed to KNH.
This comes hardly a day after she surrendered herself to authorities amid arrests aimed at those suspected of looting from NYS.
While appearing before a parliamentary committee probing the NYS saga, she rebuffed claims that she had something to do with the loss of billions of shillings from NYS coffers.
She is suspected of being part of a web of conspiracy that swindled Kenyans.
The scandal has left scores of tax-paying Kenyans in a state of shock at how such colossal amounts of money were stolen.