Kiplagat, 76, died at Karen Hospital on February 6 where he had been rushed.
“Commiserated with the family of veteran Kenyan politician Hosea Kiplagat at their Nairobi home this afternoon. May God grant them strength and fortitude during this difficult period,” Odinga wrote on his official Twitter account.
He went on, “May the soul of Hosea Kiplagat forever Rest In Eternal Peace.”
Kiplagat who was also an entrepreneur and philanthropist belonged to the Tugen ethnic community.
Kiplagat's first job was as a prison warder, but he resigned to venture into business.
He became a successful businessman and it did not take long before he captured the attention of President Moi, who saw him as an efficient political mobilizer.
During the entire Moi era, Kiplagat was a close confidant of the president. He was a long-serving chairman of the Baringo branch of KANU.
Upon President Moi's retirement in 2002, Kiplagat supported Moi's chosen successor, Gideon Moi.
Gideon won the election unopposed. However, in 2007 he ran for the Baringo Central Parliamentary seat which was won by Sammy Mwaita in the ODM primaries.
He polled third. In the March 2013 general elections, Kiplagat controversially lost to Sammy Mwaita. He then petitioned the High Court, which however upheld Mwaita's win.
On Monday, the ODM party leader joined the family, relatives, the Muslim community at large, and well-wishers of Senator Yusuf Haji at Lang'ata Cemetery in Nairobi County for his burial ceremony.
This came hours after he had joined the Omogusii community and family of former Cabinet Minister, MP, and career civil servant Simeon Nyachae as they bade him a final farewell in Kisii County.
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