NEW YORK — ABC has tapped Peter Murphy, a longtime exec at parent Walt Disney Co., to replace Ronald Doerfler as its new chief financial officer.

Murphy, 34, was named senior VP and CFO Monday, just days after Doerfler, 56, said he’d step down from the post on Oct. 31. Murphy becomes the latest in a string of Disney execs to move to key posts at ABC.

For the past nine years, Murphy has worked at Disney’s strategic planning department, where he was upped to senior VP in 1995 and was responsible for guiding the strategic development of Disney’s broadcasting and studio businesses.

He’ll now report to ABC prexy Robert Iger, who in a statement called Murphy “very helpful to me and our key ABC executives during our merger transition,” adding that “his long tenure with Disney will be invaluable in continuing coordination within the company.”

Under Disney ownership, however, the CFO post at once-independent ABC has been lessened somewhat, a factor in Doerfler’s departure. And ABC’s ratings woes have hurt the division’s financial performance, spurring layoffs and employee buyouts earlier this month and adding pressure to find new cost savings.

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