The devastated widow of a firefighter who died on New York City’s notorious “Black Sunday” — exactly 20 years ago Thursday — said she’s still struck by sudden tearful waves of grief when she least expects it.

Four firefighters died from injuries suffered on the one of the New York City fire department's darkest days. CBS News New York's John Dias reports.

It was the first time since 1918 that firefighters' lives were lost at two separate fires or emergencies in the same day, officials said.