Kibra MP, Ken Okoth (41), has passed on at The Nairobi Hospital.
The family made the announcement at a press conference on Friday.
Okoth had been diagnosed with stage four colorectal cancer which he announced in February 2019.
He was rushed to the medical facility on Thursday after his condition deteriorated. He had suffered multiple organ failure.
Close sources revealed that he had specifically stated that he did not want to be on life support and on Friday afternoon, he was pronounced dead.
Speaking to the media, Imran Okoth asked members of the public as well as the media for privacy as they grieve their late kin.
President Uhuru Kenyatta mourned with the friends and family of the deceased. "It is with a heavy heart that I have this afternoon received the sad news of the death of Kibra MP Hon Ken Okoth. Death has robbed us of an astute legislator. May God comfort his family, friends and indeed all Kenyans, during this difficult period of mourning," Uhuru posted on Twitter.
"I'm deeply saddened by the passing of our MP Hon Ken Okoth. Ken battled cancer with unique bravery while serving his voters to the last minutes of his life. May God grant peace and strength to his family and may he rest in peace," mourned former Prime Minister Raila Odinga.
"It is with great sadness that I have learnt of the passing on of Kibra MP, Hon Ken Okoth, after gallantly fighting the illness that afflicted him. Ken was a visionary, indefatigable and exceptional legislator whose commitment to House and constituency duties was unmatched," posted National Assembly Speaker Justin Muturi.
After he went public about his illness, Ken Okoth travelled to France to seek treatment.
During his stay in Paris, he would often engage with Kenyans online to keep them abreast of his progress.
Appearing in a past interview, Okoth told a local newspaper how he had been on treatment for ulcers and bacterial infections for about a year, not knowing he had cancer.
Doctors had also prescribed for him pills to manage stress and anxiety.
It was only when he sought a second opinion that he discovered that he had colorectal cancer.
The disease develops from both the colon and rectum and is regarded as the second and third leading cause of cancer deaths.
He returned to the country early this month to a rousing welcome from Kenyans who had rallied behind him, lauding him for his brevity in fighting cancer.
