Four people were killed and a fifth was injured in a mass shooting at a Midtown Manhattan office building on Monday.

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.

Familly, friends and colleagues are preparing to mourn the NYPD officer killed in this week’s Manhattan office attack at a funeral Thursday, less than two days after hundreds stood in salute as his casket received a dignified transfer to the mosque where he’ll be remembered.