Four people were killed and a fifth was injured in a mass shooting at a Midtown Manhattan office building on Monday. The injured victim was an employee at the NFL, according to NFL Commissioner Roger Goodell. Here's what we know about the four people killed:

Blackstone Inc.’s Wesley LePatner, a top executive in the firm’s $325 billion real estate business, was killed Monday when a gunman opened fire at the company’s Manhattan headquarters. She was 43.

A vigil will also be held Friday night for NYPD Officer Didarul Islam so the community can come together in mourning. CBS News New York's Christina Fan reports.