WASHINGTON (CNN) -- Federal agents have determined New York Gov. Eliot Spitzer used a high-priced call-girl ring at least eight times in recent months, and agents had him under surveillance twice this year, sources familiar with the investigation said Wednesday. Sources say New York Gov. Eliot Spitzer used a call-girl service eight times in recent months. Spitzer announced his resignation Wednesday, two days after reports of his connection to the Emperors Club VIP became public. He has not been charged with a crime. He told reporters Wednesday, "I cannot allow my private failings to disrupt the people's work." The resignation will take effect Monday. Watch Spitzer say he will resign »"Kristen" identified as aspiring singer Ashley Youmans, 22Spitzer resigns Wednesday, two days after he is linked to call-girl ringBank notified Treasury Department about suspicious transfers of moneySpitzer could face charges of money laundering, legal experts say
The newspaper said _ -- now known as Ashley Alexandra Dupre -- was identified in court documents as Kristen.