King attended Bishop Hendricken High School in Warwick, Rhode Island.

[6] On November 20, 2017, the Marlins traded King and international signing bonus money to the New York Yankees in exchange for Caleb Smith and Garrett Cooper.

[11] He made his major league debut on September 27 versus the Texas Rangers, pitching two innings in relief.

[12] In the shortened 60-game season in 2020, King recorded a 7.76 ERA in 26+2⁄3 innings pitched across nine appearances, including four games started.

[22] While playing against the Baltimore Orioles on July 22, King left the game with an elbow injury.

[24] In spring training in 2023, King suggested to manager Aaron Boone that he could be used as a starting pitcher.

[26] On December 6, 2023, the Yankees traded King, Drew Thorpe, Randy Vásquez, Jhony Brito, and Kyle Higashioka to the San Diego Padres for Juan Soto and Trent Grisham.