One of Walt Disney Co.'s top television executives, once considered a serious contender to become Disney's next chief executive, will resign next year, the company said Tuesday.

Disney Media Networks Co-Chairman Anne Sweeney, who oversees the company's ABC broadcast network and Disney Channel and ABC Family cable channels, said she would leave in January 2015 to pursue a career in television directing.

Disney didn't immediately name an executive to replace the 18-year company veteran.

The announcement comes as the cable channels under Ms. Sweeney have been performing well and expanding overseas, but as revenue and operating income at the ABC network have declined.

Once frequently mentioned on a short list of candidates to replace Disney Chief Executive Robert Iger, who plans to retire in June 2016, Ms. Sweeney hasn't recently been named as a likely replacement by company insiders. Chief Financial Officer Jay Rasulo and parks & resorts chief Thomas Staggs are now viewed as the top contenders.

Write to Ben Fritz at ben.fritz@wsj.com

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