A police officer and three other people were killed after a gunman opened fire Monday evening at a Midtown Manhattan office building that houses The Blackstone Group and NFL headquarters, police

The Manhattan office building shooting victims include NYPD Officer Didarul Islam, Blackstone executive Wesley LePatner and security guard Aland Etienne.

Blackstone employees struggled on Tuesday to come to terms with the death of Wesley LePatner, one of the investment firm's senior executives who was gunned down late on Monday as she was leaving her Midtown Manhattan office.