According to another unnamed source, she failed to translate a last-minute offer from Kim, delivered as US President Donald Trump was threatening to walk away from the talks.
Neither North nor South Korean authorities have confirmed the reports.
Trump and Kim have met twice, in Hanoi in February and Singapore in June, building goodwill but failing to agree on a deal to lift sanctions in exchange for North Korea abandoning its nuclear and missile programs.
In January, Lewis authored a report listing the February 8 plant as one of several sites that North Korea's leaders had visited in the past without fully disclosing the location or goal.
"Instead, they put in someone like Kim Hyok Chol to insulate Choe Son Hui and more substantive diplomatic personnel, to a certain degree he is expendable and his superiors are not".
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So there's a lot that unites the US and India when it comes to analysing and assessing Iranian activity", the official said. The official said the Trump administration welcomed India's efforts to further develop trade with Afghanistan.
The regime accused them of spying for the United States.
The U.S.is trying to check the information of the report, U.S. Secretary of State Mike Pompeo said at a news conference while in Berlin on Friday. "I can tell you we're monitoring the situation and continue to stay focused on our ultimate goal which is denuclearization".
"There are traitors and turncoats who only memorize words of loyalty toward the Leader and even change according to the trend of the time", the commentary said".
A single anonymous source told a newspaper in Seoul that Hyok Chol, a key figure in talks ahead of the Hanoi summit, was executed at an airport in Pyongyang. Supposedly executed officials have later appeared trotting alongside Kim on state TV after their reported demise.
Kim Yong Chol, Kim Jong Un's right-hand man and the counterpart to Pompeo before the Hanoi summit, had been sent to a labor and reeducation camp in Jagang Province near the Chinese border, the Chosun Ilbo reported. Don't be too surprised if North Korea names new people to these positions in the next few days.
In 2013, the Chosun Ilbo reported that Hyon Song Wol, a famous North Korean artist the newspaper described as Kim's "ex-girlfriend", was executed in public along with several other performers over accusations that they filmed themselves having sex and selling the videos.
The North Korean tyrant has shown he does not tolerate failure after he had Kim Hyok-chol and others were killed on his orders.