Witnesses cited by CNN said a woman paced the platform and talked to herself Thursday evening shortly before pushing Sen as the 11-car train entered the station.
The body of 46-year-old Sen, a graphic designer for posters who ran a small copying business called New Amsterdam Copies on the Upper West Side, was pinned under the second car after it came to a stop.
The woman made "statements implicating herself in the death of Sunando Sen," Paul Browne, the New York Police Department's chief spokesman, said earlier. Security video showed a person running from the scene.
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