He said that he felt bad that he pressed charges, but that she seemed dangerous.
"I really believe if she had a knife, she would have killed me," he said.
In December 2003, Menendez was arrested for cocaine possession. She was given a conditional discharge after pleading guilty.
Last Thursday, witnesses said a woman pacing and mumbling to herself suddenly shoved Sen off the elevated platform of a No. 7 train that travels between Manhattan and Queens. She fled.
Menendez was spotted by a passer-by who called 911 and said she resembled the wanted suspect. When she was arrested, she told police she shoved Sen because she blamed Muslims and Hindus for the Sept. 11 terrorist attacks and had been "beating them up" ever since, according to authorities. She said she thought Sen was Muslim.
Sen, a Kolkata native, owned a print shop and had lived in Queens for decades.
She laughed and snickered so much during her court hearing last weekend that the judge admonished her. The attorney who represented her only for her arraignment said she acted the same way with him when he tried to speak with her. He had no further comment.
Calls to Menendez's home on Monday were unanswered. 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 on the murder charge.
"It surprised me what she did," he said. "She never acted that way."