The Blackstone executive who was killed in Monday's mass shooting in Manhattan was on her way out to meet a friend for a drink when she was shot dead in the lobby, it has been revealed.

Wesley LePatner, 43, was on her way out of the 345 Park Avenue skyscraper where she worked when crazed gunman Shane Tamura, 27, killed her and three others in a horror shooting spree.

The mother-of-two tried to cower behind a pillar for cover but was killed by Tamura, who also shot dead off-duty police officer Didarul Islam, security guard Aland Etienne, and Julia Hyman, a young worker at Rudin Management.

The colleague who was set to meet LePatner for a drink after work then came down in the elevator and saw her lying on the floor, according to the Wall Street Journal.

Another Blackstone employee told the outlet that she had a terrifying near-miss as she was waiting for an elevator to the lobby to pick up a DoorDash dinner when the delivery driver messaged her to warn her about the active shooter.