On December 10, 2019, the Stars fired Montgomery for "unprofessional conduct inconsistent with the core values and beliefs of the Dallas Stars and the National Hockey League." At a press conference, general manager Jim Nill said the situation had come to light the previous weekend, and involved "a material act of unprofessionalism" egregious enough to demand Montgomery's immediate firing. He did not offer specifics "out of respect for everyone involved," only saying that it did not involve abuse of players or criminal conduct. Rick Bowness, who joined the team a month after Montgomery's hiring in May 2018, was named interim coach, while Derek Laxdal (who was the head coach of the Texas Stars at the time) would be promoted to the assistant coaching position that was vacated by Bowness.