(CNN) -- The International Criminal Court prosecutor handling accusations of crimes against humanity against four prominent Kenyans -- including the country's newly elected president -- dropped charges Monday against one of the men, citing dead, fearful or tainted witnesses and government stonewalling.
Prosecutor Fatou Bensouda said the decision to drop charges against former Cabinet Secretary Francis Kirimi Muthaura in connection with post-election violence in 2007 had nothing to do with last week's election of Uhuru Kenyatta as Kenya's next president.
"My decision today is based only on the specific facts of the case against Mr. Muthaura, and not on any other consideration," Bensouda said in a statement posted to the court's website. "While we are all aware of political developments in Kenya, these have no influence, at all, on the decisions that I make as prosecutor of the International Criminal Court."
Instead, Bensouda said investigators had run up against myriad problems pursuing the case, including witnesses who had died and others who were too afraid to testify.
The Kenyan government failed to help and prosecutors also had to drop a key witness who recanted some evidence and acknowledged taking bribes, Bensouda said.
Last year, ICC judges found probable cause to pursue charges against Muthaura, Kenyatta and two others of being "indirect co-perpetrators" in the 2007 violence following a disputed presidential election.
According to the ICC, Kenyatta, Muthaura and the others directed a wave of mostly ethnic violence in January 2008. The violence followed the 2007 elections in which the incumbent president was declared the winner despite widespread allegations of vote fraud.
As many as 1,220 people died and more than 350,000 people were displaced by the violence, according to the ICC.
Prosecutors accused Muthaura of making connections, providing funding and using intermediaries to mobilize attackers. Kenyatta, prosecutors say, provided "institutional support" for the violence.
It's unclear what impact the decision to drop charges against Muthaura could have on the case against the remaining three defendants. But a source close to the situation at The Hague, Netherlands, said the decision could have a "snowball effect" that could lead to the dismissal of all the charges.
"There's more evidence, but not much more," the source said. "This case is not a done deal."
ICC officials did not immediately respond Monday to CNN requests to comment on the source's allegations.
Kenyatta, who like the others charged has said he is innocent, has asked the court to reconsider whether the charges are valid, citing a lack of eyewitness evidence, according to court filings.
Zain Verjee reported from London, Michael Pearson reported and wrote from Atlanta. CNN's Nima Elbagir also contributed to this report.