Police Officer Didarul Islam, a father of two with a baby on the way, was one of the four people killed by Shane Tamura inside 345 Park Ave. on Monday.

The alleged gunman at a shooting rampage in a midtown Manhattan office building was identified as 27-year-old Shane Tamura, of Nevada.

Didarul Islam, a 36-year-old NYPD officer, was off duty and working a security job when he was fatally shot by a gunman who opened fire at the 345 Park Avenue office building on Monday.