Erika Menendez spoke to The New York Post (http://bit.ly/U8e2xz ) on Friday at the city jail where she is awaiting trial in the killing.
Menendez tells the newspaper her "mind was just racing" the day of the attack.
She says, "I was homeless. I was hungry. I was fighting with my boyfriend. He came running up the stairs, and I just got up and pushed him."
Menendez says she picked her victim because of his ethnicity.
Slain 46-year-old Indian immigrant Sunando Sen was Hindu. Menendez says she has "been beating up Muslims and Hindus for a long time."
Menendez is charged with murder as a hate crime after she told police she spontaneously pushed Sen.
She laughed so hard during her arraignment in Queens criminal court that Judge Gia Morris told her lawyer: "You're going to have to have your client stop laughing."
Defense attorney Dietrich Epperson said Menendez's behavior in court was no different from how she had been acting when he spoke to her privately, and said his client didn't really think the proceedings were funny. He represented her for the arraignment only and had no further comment.
Menendez was held without bail and ordered to have a mental health exam.
Prosecutors said Menendez pushed Sen, a 46-year-old native of India, to his death because she blamed "Muslims, Hindus and Egyptians" for the Sept. 11 terrorist attacks.
"I pushed a Muslim off the train tracks because I hate Hindus and Muslims - ever since 2001 when they put down the twin towers I've been beating them up," Menendez told police, according to the Queens district attorney's office.
Friends and co-workers said Sen, a native of Calcutta, was Hindu. He had lived in Queens for decades and was a graphic designer and copy shop owner. Sen was standing on an elevated platform of the 7 train that travels between Manhattan and Queens when he was shoved from behind as the train entered the station.
Witnesses told police a woman had been mumbling to herself and was sitting on a bench behind Sen until the train pulled in, then shoved him from behind. She then fled.
Police released a sketch and surveillance footage of a woman running from the subway station. Menendez was arrested after a passer-by saw her on the street and thought she looked like the wanted suspect. Witnesses identified her in a lineup and she was questioned by police, when she implicated herself, according to police and prosecutors.
Angel Luis Santiago, who used to work at the Queens building where Menendez's mother and stepfather live, said he was shocked by her arrest.
"It surprised me what she did," he said. "She never acted that way."
According to the district attorney's office, Menendez said, "There is no reason. I just pushed him in front of the train because I thought it would be cool."
Sen was the second man to die after being pushed in front of a New York City subway train in the past two months. Ki-Suck Han was killed in a midtown Manhattan subway station on Dec. 3. A homeless man was arrested and charged with murder in that case and is awaiting trial. He claimed he acted in self-defense.
Such subway deaths are rare, but transit officials said they would consider installing barriers with sliding doors on some subway platforms. Other cities including Paris and London have installed such barriers.
Associated Press Writer Karen Matthews contributed to this report.
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