On February 17. 2020, Madden's rights along with Tim Schaller, a 2020 second-round pick, and a conditional 2022 fourth-round pick were traded to the Los Angeles Kings in exchange for Tyler Toffoli.[2] On March 30, 2020, he signed a three-year entry-level contract with the Kings, forgoing his final two seasons of college eligibility.[3]
Due to the delayed start of the 2020–21 North American season, Madden was loaned to Eisbären Berlin until the start of the season. However, before he could play a game, he was recalled due to injury.[4][5]