A New York City subway station as seen in 2012
Spencer Platt/Getty Images

Melanie Liverpool, 30, admitted during an interrogation Monday that she was linked to a previous deadly subway incident after being suspected of pushing another woman in front of a subway train in New York City, CBS News reports.

According to CBS, the New York City Police Department has confirmed that investigators are now taking another look at an Oct. 19 subway death at the Union Square station in Manhattan that had been ruled a suicide.

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In the meantime, Liverpool is expected to be arraigned on a charge of second-degree murder Tuesday in the most recent subway fatality. According to CBS News, she was arrested shortly after reportedly pushing a 49-year-old woman in front of a No. 1 train at the Times Square station Monday, where the victim died.

"They saw this woman push another woman and they flagged down two police officers," said NYPD Chief of Manhattan South Detectives William Aubry about the witnesses standing by.

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Apparently Liverpool has a history of mental illness.

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Read more at CBS News.