The 121st Boston Marathon included the first woman to officially run the race 50 years ago

In 1967, Katherine Switzer registered using her initials to hide her gender because the race was an all-male event.
1:24 | 04/17/17

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Transcript for The 121st Boston Marathon included the first woman to officially run the race 50 years ago
America strong and the Boston marathon. At the starting line today, a runner returning. The first woman to run the race 50 years ago, though she hid it then. Here's ABC's linsey Davis. Reporter: This morning, Kathrine Switzer was one of more than 13,000 women running the Boston marathon. Hi, everybody. It's Kathrine Switzer. Reporter: 50 years ago, she was the only one. Back in 1967, the Boston marathon was an all-male race. Women were considered too fragile to run the distance. This Syracuse coed secretly registered as kv Switzer to hide her gender. Taking the course in a sea of men until the marathon director was alerted about a woman in the race. And I turned and he grabbed me. He screamed at me. Get the hell out of my race. Reporter: Her boyfriend then pushed that race director off the road. I realized if I quit the race. No one would believe women deserve to be there or they could do the distance. Reporter: And that she did, finishing in 4 hours and 20 minutes. This afternoon, surrounded by members of 261 fearless, the running club she created to empower women. She crossed the finish line again. While they retired her bib number tonight she has no plans of doing the same. Linsey Davis, ABC news, Boston. Great to see Kathrine back. Thanks for watching.

This transcript has been automatically generated and may not be 100% accurate.

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