RIVERHEAD, N.Y. (CBSNewYork/AP) — The friend of a woman, who has accused a former New York City investment banker of raping her at an East Hamptons house, cried throughout her testimony Tuesday.

The judge at the non-jury trial allowed the woman from Ireland to testify Tuesday using only her first name: Fiona.

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Fiona said they had gone to a small birthday gathering at the house after a night of drinking at a club in August 2013.

Prosecutors allege Jason Lee, 38, a former managing director at Goldman Sachs, broke through the bathroom door while nude, knocking the woman to the floor. They say he then raped her as she tried to fight him off.

The defense contends that the woman was drunk on vodka and champagne and paired up with the investment banker voluntarily after a night of partying.

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Fiona testified that her friend came out of the bathroom looking upset.

Suffolk County District Attorney Tom Spota said the woman was treated at a hospital following the assault. The woman, who was from Ireland but was working in the U.S. at the time, is expected to testify during the trial.

Lee has pleaded not guilty. His lawyer said the two had consensual sex.

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