Steve Bornstein, who had held the post only since May 2001, is leaving as the network remains in a difficult stretch with low ratings for its programs and declining ad revenue.
The departure comes as ABC readies for the annual upfront presentation of its fall season programming to advertisers May 14. As the network's rating have fallen this season below what it guaranteed advertisers, ABC has lost money by having
Mr. Bornstein, formerly CEO of ESPN, said he plans to pursue other interests.
An ABC spokeswoman said no one will replace Mr. Bornstein in the immediate future. His role is being restructured, she said, though she did not go into detail.
Earlier this year, ABC also lost two other top executives: Stu Bloomberg, co-chairman of ABC Entertainment, who resigned, and Alan Cohen, a chief marketing executive who went over to News Corp.'s Twentieth Century Fox.