A Queens woman has been charged with second-degree murder after police say she pushed another woman onto the tracks in front of an oncoming southbound 1 train as it approached the Times Square-42nd Street station Monday afternoon.

According to NYPD Chief of Manhattan Detectives William Aubry, the 49-year-old victim, who was not immediately identified, was pushed onto the tracks around 1:20 p.m. She was pronounced dead at the scene, police said.

Witnesses immediately flagged down two officers who were standing on the platform, Aubry said during a late afternoon news conference.

The suspect, identified as Melanie Liverpool-Turner, 30, was apprehended by Transit Bureau police officers "within a couple of moments," according to NYPD Transit Chief Joseph Fox.

Liverpool-Turner was taken into custody and brought to the Midtown South Precinct, where she was later charged, Aubry said. Witnesses were also taken to that precinct to be interviewed.

While it appears the victim and suspect did not know each other, police said they exchanged words before the victim was pushed.

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“We have a lot of work to do; it's still preliminary in the investigation," Aubry added. "We are looking at video now and we're trying to capture the perpetrator and also the victim as they're entering into the train station."

Larissa Diaz, 25, works at the clothing store across from the entrance to the No. 2 platform and realized something was wrong when she heard yelling. 

"There were so many people outside, screaming," she said. "I didn't know what was happening. It's crazy, it's scary." 

After the altercation, there were service changes on the 1, 2 and 3 lines for several hours, the MTA said. All lines resumed normal service around 6:14 p.m.