(CNN)-- For the second time in a month, a man has been shoved to his death in front of a train on a New York City subway platform, police said.

Police are searching for a woman seen running from an elevated station for the No. 7 train in Queens on Thursday evening, Deputy Commissioner Paul Browne said in a statement.

According to witnesses, the woman was pacing the platform and talking to herself shortly before pushing the man onto the tracks as the 11-car train entered the station.

The man's body was pinned under the second car after it came to a stop. Police have not announced his identity.

Police describe her as a heavy set woman in her 20s, wearing a ski jacket and sneakers. Security video shows her running from the scene, shortly after 8 p.m.

In early December, Ki-Suck Han, 58, was shoved onto the tracks in a Times Square station as a train approached.

Naeem Davis, 30, a homeless man, has been charged with second-degree murder in the case.