Wesley LePatner, 43, was among the four people killed by a gunman who stormed the Park Avenue building where she worked on Monday.

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.

"We cannot properly express the grief we feel upon the sudden and tragic loss of Wesley," the LePatner family told Fortune, adding she was a "driven and extraordinarily talented professional and colleague.