Jessika Heiser is an American professional wrestling referee and professional wrestler. She is signed to WWE, where she performs as a referee under the ring name Jessika Carr, as well as wrestling on the Evolve brand as Kalyx. After signing with the company in 2017, Heiser became the first female WWE referee since the 1980s.

On October 21st 2021, Heiser refereed at Crown Jewel, becoming the first woman to referee in Saudi Arabia, as well as becoming the first female to referee a Hell in a Cell match. On May 4th 2024, she became the first female referee in WWE to officiate a world title main event at Backlash. On January 6th 2025, she became the first referee to officiate a main event on Netflix.