Monaco and her older sister lived in Derby, Connecticut in 1978. They took a vacation trip south to Virginia Beach, Virginia on August 20, the day after Monaco's eighteenth birthday, and registered at the Aloha Motel on 15th Street. They planned to stay in Virginia for a week.

Monaco was last seen at 1:00 a.m. August 23, when she left her sister and began walking to a bar called Peabody's, where she had arranged a date with a bartender. The bar was six blocks away from the hotel. Witnesses saw Monaco get into a car on Pacific Avenue; the vehicle reportedly contained four or five men. She never arrived for her date and has never been heard from again. (Information retrieved from NamUs.gov)