Nyenze died in Nairobi on December 8.
Nyenze passed on at Nairobi Hospital in Nairobi on December 8, thanks to colon cancer.
As the service is already underway, Pulse Live has gathered a number of photos to give an insight view of what is happening.
Meanwhile, Nasa co-principal Mr Kalonzo Musyoka is set to miss the burial of the former Minority leader in the National Assembly after he allegedly missed a flight in German where he is attending to his sick wife Pauline.
It is also expected that President Uhuru Kenyatta and Nasa leader Raila Odinga could attend the burial.
Other Ukambani leaders who are in attendance include Kitui Governor Charity Ngillu, Kivutha Kibwana, former Machakos Senator Johnson Muthama and Kimilili MP Chris Wamalwa and ODM national chairman Mr John Mbadi.