According to a close source, the late Cabinet Secretary went for a check up at Karen Hospital after attending a prayer rally at Uhuru Park.
Chief of Staff and Head of the Public Service Joseph Kinyua confirmed the news in a statement early on Saturday.
“It is with deep sorrow and shock that we announce the sudden passing on of Interior CS Retired General Joseph Nkaissery. Gen. Nkaissery passed on at Karen Hospital in Nairobi a few hours after being admitted for a check-up. The country to be updated as more information becomes available,” Mr Kinyua said.
Mr Nkaissery went to Karen Hospital at around 3pm after leaving Uhuru Park where he had accompanied President Uhuru Kenyatta.
“He actually looked okay but he said he needed to go to hospital as he was not feeling well,” the source said.
His body has been moved to Lee Funeral Home.
President Kenyatta picked Nkaisery from the opposition to head the Ministry of Interior and Coordination of National Government on December 2, 2014, to replace Joseph Ole Lenku.
Before that, he was the member of parliament for Kajiado Central constituency on an Orange Democratic Movement (ODM) ticket.
Kenyans on Saturday woke up to the demise of Interior Cabinet Secretary Joseph Nkaissery.