A man who walked into a doughnut shop for a cup of coffee walked out a hero after he averted a potentially life-threatening leak.

Nassau County AMT Joseph Biundo says he stopped at the Dunkin' Donuts on Glen Cove Road in Carle Place on Friday morning. He was wearing a personal monoxide detector, and to his surprise, it went off.

Biundo says he exited the store and his device went back...

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