Baringo South MP Grace Kipchoim succumbed to cancer at Nairobi Hospital on Friday morning.
The 49-year-old had suffered from acute colon cancer for close to two years.
Her Personal Assistant Mary Chepkong’a said she died minutes after 4 am.
Kipchoim was re-elected on a Jubilee Party ticket on August 8, 2017 despite being sick.
She did not campaign due to the illness but won the tough race for reasons such as her development track record and security initiatives.
"Her heart bled because of insecurity and water shortages. She also wanted to see the displaced resettled and title deeds issued to residents of Mochongoi," Chepkong’a said.
In the election, the MP got 10,300 votes while her closest rival Charles Kamuren got 10,184. The race included six other male contenders.
Kamuren was aggrieved by the results but did not go to court. He lost a petition against Kipchoim in 2013.
"I decided to leave everything to God although I was beaten up by police on election day and the vote was rigged," he said at the time.