On August 21, 2009, King was named the assistant coach of the
Toronto Maple Leafs AHL affiliate the
Toronto Marlies. In 2014, he was promoted to associate coach. On July 28, 2015, King was named assistant coach of the
Owen Sound Attack of the
Ontario Hockey League. However, he left the Attack on October 28, 2015. On July 7, 2016, King was named an assistant coach with the
Rockford IceHogs of the American Hockey League, the minor league affiliate of the
Chicago Blackhawks. On November 6, 2018, King was named the interim head coach of the IceHogs when head coach
Jeremy Colliton was promoted to the Blackhawks. King was named the permanent head coach of the IceHogs at the end of the 2018–19 season. On November 6, 2021, King was named interim head coach of the
Chicago Blackhawks of the
National Hockey League to replace the dismissed Colliton, who led the team to a 1–9–2 start to the
2021–22 season. On November 7, 2021 King earned his first win as an NHL head coach as the Chicago Blackhawks defeated the
Nashville Predators by a score of 2–1 in overtime in his head coaching debut. On June 27, 2022, King was replaced as head coach of the Blackhawks by former
Montreal Canadiens assistant and longtime NHL defenseman
Luke Richardson, but rehired 14 days later as an assistant coach. On August 4, 2025 the
Hershey Bears announced King as the 29th head coach in franchise history, replacing
Todd Nelson who left the organization after winning two
Calder Cup titles in his 3 year tenure. ==Career statistics==