It would be the first officially-registered participation by a woman in a marathon.
"I expected victory since I had trained well for this race", said Kirui, who drew motivation from Kenyans who had won the race before like Korir, Geoffrey Mutai and Robert Cheruiyot.
Switzer is running again this year on the 50th anniversary of her landmark performance. She refused to hide.
"I was very proud of being a woman".
In her memoir, Marathon Woman, Switzer recalled the moment she was attacked. The women's marathon was added to the Summer Games in 1984. "...nor was there anything indicating gender on the entry form. Women rarely participated. Most people assumed that women could not run the marathon distance and if they tried they would hurt themselves", she remarks in her memoir.
At the point where she was once confronted by that race official, she posted a Facebook Live video - smiling as she ran, with her bib number, 261, pinned safely in place. New records were set for both wheelchair races, with Swiss racer Marcel Hug taking home the win for the men at 1:18:04, and Manuela Schar, also of Switzerland, winning for the women with a time of 1:28:17.
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She wore her original number - 261 - which was retired by race organisers after she crossed the finish line as a mark of honour.
"...an official tried to eject me from the race simply because I was a woman".
"I turned to Arnie and said, 'I'm going to finish this race on my hands and my knees if I have to, '" she said.
In 1967, Switzer finished in 4 hours, 20 minutes.
On Monday, wearing the very same number which she had nearly had torn off her jumper five decades earlier, Ms Switzer completed the race in four hours, 44 minutes and 31 seconds in her "full regalia" - "the bib plus the eye liner, mascara and lipstick". There hasn't been word yet on why the woman needed to be carried, but when it comes to marathons, injuries and cramping are commonplace.
Kathrine Switzer, now 70, was the first woman to cross the line in an all-male race in 1967. Now, almost half of all marathoners in the USA are women.