2017–2021: USC Trojans In June 2019, Cockrell became the
NCAA champion at
the year's NCAA championships for the women's 400-meter hurdle event with a time of 55.23 after being a runner-up in each of the two years prior. In August 2019, she won the silver medal in the
women's 400 metres hurdles event and the gold medal in the
women's 4 × 400 metres relay event at the
2019 Pan American Games held in Lima, Peru. before helping to lead her school to a third consecutive conference team title at the 2021 Pac-12 championships by winning the women's 100-meter and 400-meter hurdles events. The following month, after the cancellation of the prior year's competition due to the
COVID-19 pandemic, Cockrell became the 2021 NCAA champion for the women's 100-meter hurdles and 400-meter hurdles events to help drive her school to win the team title at the
2021 NCAA Division I Outdoor Track and Field Championships. She ran the 100-meter hurdles with a time of 12.58 and the 400-meter hurdles with a time of 54.68 and became the second woman in history to win both events in the same season at the NCAA championships. Her achievements led her to receive the 2021
Honda Sports Award for track and field and the Pac-12's Tom Hansen Conference Medal for the year. At the Olympics, Cockrell qualified for the semifinals after coming in third in her heat race with a time of 55.37. She later finished in second place with a time of 54.17 in the semifinals, landing her a spot in the final.
2024 Summer Olympics At the 2024 Olympics in Paris, Cockrell won a silver medal in the women’s 400-metre hurdles. She came second to Sydney McLaughlin-Levrone, with a personal best time of 51.87sec.
Circuit performances == Personal life ==