A married father of two with a third child on the way, the 36-year-old was working a New York Police Department-approved private security detail, in uniform, when he and three other people were killed Monday at the Manhattan skyscraper that houses the NFL's headquarters and other corporate offices.

The 36-year-old, one of four who died in a Midtown Manhattan mass shooting, left behind a pregnant wife and two young boys.

New York City police officers lined city streets to honor their colleague who was killed when a gunman entered a Midtown Manhattan office building and opened fire earlier this week.Officer Islam was one of four people killed inside the building on Monday evening.