At the 2024 Summer Olympics, she won a gold medal in the 4x100 meter medley relay, where she swam the breaststroke leg.

[6] The lanes at Lloyd Pool were often overcrowded, preventing King from receiving the necessary workout she required to perform at her best competitive level, so to help compensate, King added several morning practices a week with the local masters team and joined a competitive swim team called the Newburgh Sea Creatures.

The next fastest swimmer was Yuliya Yefimova from Russia, the reigning world champion who had previously served a 16-month doping suspension for failing a 2013 drug test.

[18][19] At the 2017 US Nationals, the qualification meet for the World Aquatics Championships in Budapest, King swept the breaststroke events.

The race was highly anticipated because Efimova had nearly broken the former world record and mockingly wagged her finger during the semifinal.

[21] At the 2018 US Nationals, the qualification meet for the World Aquatics Championships in Gwangju, King won two of three breaststroke events.

[23] King competed in a total of three events at the 2018 Pan Pacific Championships held in Tokyo, Japan, in August 2018.

[27] In the 200-meter breaststroke, King was disqualified in the prelims heats for not touching the wall simultaneously with both hands on one of her turns.

Lastly, King was a part of the world record-breaking 4x100-meter medley relay with Regan Smith, Kelsi Dahlia, and Simone Manuel in a time of 3:50.40.

[27] In 2019 she was a member of the inaugural International Swimming League representing the Cali Condors, who finished third place in the final match in Las Vegas, Nevada, in December.

[35] In her post-win interview for the 100-meter breaststroke on the NBC telecast covering day three of the US Olympic Trials in swimming, King expressed excitement about getting to call herself a two-time Olympian.

[43][44] At the 2020 Summer Olympics in Tokyo, Japan, King swam the third fastest time overall in the prelims of the 100-meter breaststroke and advanced to the semifinals.

[47][48] In the final, King won the bronze medal with a time of 1:05.54, less than a second behind the first-place finisher, American Lydia Jacoby, who swam a 1:04.95.

"[50] On day five of competition, King swam a 2:22.10 in her prelims heat of the 200-meter breaststroke, qualifying for the semifinals ranking second overall behind South African Tatjana Schoenmaker.

[59] The second day of final match competition, King won the 100 meter breaststroke with a time of 1:03.75 and earned 10 points for her team.

[63] At the 2022 FINA World Swimming Championships (25 m) in Melbourne, King won gold in the 100-meter breaststroke and the 4x100m medley relay.

[67][68] In the finals, King swam with a time of 1:05.60 and tied for fourth place, missing the bronze medal by 1/100th of a second.

[76] After watching King’s 200-meter breaststroke performance at the 2024 Olympic Trials, her boyfriend James Wells proposed to her.