John O’Mahony, who worked as an editor, reporter and columnist for the New York Post for 12 years, died Friday in Manhattan at age 63 after suffering a heart attack.

O’Mahony began working at The Post in 1993, and within a year he was back in his native Ireland covering the Northern Ireland peace process as a Post correspondent.

In 1999, he became a news-features editor and in 2001 he was promoted to ­associate city editor.

Genial, hardworking and possessed of a charming brogue, he was always amenable to a new idea and an ­after-work nightcap with colleagues.

Lately, he had been writing frequently for Bloom­berg Businessweek and producing and editing through Blossom Trail, the company he founded with ex-wife and longtime friend Maya O’Mahony.

“He was a good man and Ill miss him terribly,” Maya told The Post Saturday.

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