The late superintendent also may have suffered from pre-existing heart issues that played a role in his death, law-enforcement sources said.

Cops received a 911 call just after 7 p.m. about a man who was spotted waving a gun at people near East 107th Street and Madison Avenue in Manhattan, according to sources and the NYPD.

The robber left with a haul of baseball and Pokemon cards worth $9,710, police said.

A friend described the victim, a married dad to three young kids, as a hard-working man and "the best guy."