The matatu driver involved in the Wednesday morning accident along Naivasha-Nairobi Highway has been put in a life support machine.
Jubilee Secretary General Raphael Tuju was also injured in the morning crash and was airlifted to Nairobi for further treatment after complaining of chest pains.
The driver was unconscious after the accident and was rushed to the Kijabe Mission Hospital.
Three vehicles were involved in the accident as Tuju was making his way to the Kabarak University grounds where the funeral service for the late former President Mzee Moi is being held.
The other 12 passengers who sustained minor injuries were also rushed to Kijabe Mission Hospital.
One of the passengers sustained an injury on the chest while another sustained a head injury.
The two, however, are in stable condition.
Tuju's driver Austin Oindo had a fracture of the right leg while his bodyguard Charles Oyaro sustained a fracture of the right hand.
The car carrying Tuju was involved in the accident as it collided with another car that was trying to avoid the accident.
Witness Bedon Njonge said the matatu driver underestimated the speed at which the Prado was moving.
Machakos Governor Alfred Mutua, CSs Amina Mohammed (Sports), Joe Mucheru (ICT) and James Macharia (Transport) visited Tuju in hospital.
Police from Lari police station visited the scene of the accident and towed the three vehicles involved in the accident to the station yard waiting for inspection.
The final journey to Mzee Moi was held in Kabarak which was attended by President Uhuru Kenyatta, his deputy William Ruto among other leaders.
