In an unexpected announcement, Christina Miller announced today that is stepping down as president of Cartoon Network, Adult Swim, and Boomerang. She had been in the role for five years.
Here is what we know about the situation:
- Miller had served as president of Cartoon Network, Adult Swim, and Boomerang since 2014, when she replaced Stu Snyder. Prior to her role at Cartoon Network, Miller worked for sister company Turner Sports, where she oversaw NBA Digital’s portfolio. She first joined Turner (Warnermedia) in 2005 as senior v-p of Cartoon Network Enterprises, overseeing the network’s consumer products and home video businesses.
- “This is not a decision I came to lightly,” said Miller. “It’s one of the hardest I’ve had to make in my career.” The full text of an internal letter that Miller sent to Cartoon Network employees today can be read below.
- Earlier this year, it was reported that Miller was under consideration for a more prominent kids and family role at Warner Bros. as AT&T aimed to integrate Cartoon Network more closely with Warner Bros. Animation. Sources told Deadline today that, “Miller was asked to stay on by the new Warnermedia leadership but opted to leave.”
- Twenty-three year Cartoon Network veteran Michael Ouweleen will serve as interim president of cartoon Network. Miller will stay on through the end of this year, and will work with Ouweleen on transition strategy.
- Miller joins a long line of high-profile Warnermedia execs who have exited the company in the past couple years as AT&T resets its cable brands for the streaming age. Other executives who have left include HBO head Richard Plepler, Turner CEO John Martin, Turner president David Levy, Warnermedia ad sales president Donna Speciale, Warnermedia chief of marketing and brand strategy Molly Battin, and Warner Bros. CEO Kevin Tsujihara.

Miller’s letter to CN employees is below: