I recently wrote about the Canadian triathlete Julie Miller, who was disqualified from the Ironman Canada race last summer and stripped of her first-place finish in her age group. Officials said it would have been impossible for her to complete the course as quickly as she claimed.

Other athletes suspected her of cutting the course, possibly by failing to complete one of the laps in the two-lap marathon, but no one could prove how she did it. Among other things, Miller finished the race without her timing chip, meaning that there was no information about her split times — interim times reflecting an athlete’s progress along the course.

Miller emphatically denied the accusations. “I did not cheat in the Whistler Ironman competition,” she said in an email, “nor would I ever cheat or have I ever cheated in any competition.”

After The New York Times published the article, I was contacted by FinisherPix, a company that creates personal highlight videos for athletes competing in Ironman races using video from cameras positioned along the course. The company had six video cameras filming constantly along the marathon course at Ironman Canada — one at the start, four at the finish, and one at a point in the course that runners had to pass twice. FinisherPix shared its video with The Times to help determine whether Miller had completed the race fairly.