Earlier this week it was revealed that singer Billy Joel’s daughter, Alexa Ray Joel, had been cyberstalked via Facebook. According to a report from the New York Post, the stalker sent dozens of messages to Alexa, some including references to assault, pedophilia, and murder. Alexa was reportedly too frightened of the messages to leave her house.

Billy Joel has now hired a bodyguard for his daughter. The body guard was reportedly hired from a private security firm recommended by Paul McCartney.

Private detectives were also hired to track down the stalker, who turned out to be a woman who lives in Austin, Minnesota. The woman, Sheryl Finley, has a history of mental illness, according to the Post report.

Alexa Ray Joel, who is 27 years old, is the daughter of Billy Joel and supermodel Christie Brinkley. Like her father, she plays the piano and is a singer-songwriter. Alexa released an independent album titled Sketches in 2006. She is also the spokesmodel for Prell shampoo.