The witness provided a detailed statement to detectives from the Directorate of Criminal Investigations (DCI) in Nairobi last week.
Cyrus Jirongo, a prominent political figure from the 1990s, died earlier this year.
Initial police reports had indicated the former minister died from natural causes at a city hospital.
The standard investigation into his death remained open but inactive until the new testimony emerged.
The eyewitness claimed to have observed specific events on the day of Jirongo's death that were not part of the official record.
This account prompted investigating officers to reopen certain lines of inquiry and review initial evidence.
Authorities have not publicly identified the witness or disclosed the precise nature of the new observations.
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A DCI spokesperson confirmed the receipt of the new information and stated that all credible leads were being pursued.
The spokesperson emphasized that the investigation remained active and that no conclusions had been finalized.
Jirongo's family, through their legal representative, acknowledged awareness of the development and reiterated their call for a comprehensive probe.
Cyrus Jirongo served as a Member of Parliament for Lugari constituency and held several cabinet portfolios in the 1990s.
He was a founding member of the youth wing that championed multi-party politics in Kenya.
His later years involved significant legal challenges, including a high-profile bankruptcy case.
The post-mortem examination conducted after his death had yielded a preliminary finding, but the full report awaited further tests.
Investigators are now working to corroborate the latest account with forensic evidence and other witness statements.
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