According to La Republica newspaper, van der Sloot lost his temper when Flores discovered his connection to the Holloway case and tried to use his laptop computer without asking. A government official in Peru confirmed the news to NBC.
"I did not want to do it. The girl intruded into my private life," the newspaper quoted him as saying. "I went to her and I hit her. She was scared, we argued and she tried to escape. I grabbed her by the neck and hit her."
Van der Sloot was arrested Thursday in Chile after Flores, a business student, was found dead on May 30 in his hotel room in Peru. It was exactly five years after Holloway disappeared.
Security cameras caught the two heading into Van der Sloot's hotel room together after meeting while playing poker at a casino. He left the room four hours later alone carrying a backpack. Flores was found battered with her neck broken two days later.
Chilean police told reporters previously that van der Sloot claimed he was innocent in the Peru killing. Now that a confession has been made,CNN reports
that van der Sloot may be formally charged as early as Tuesday.