Authorities in Blount County say a man posing as a Christian rock singer is accused of sex crimes against minors, and they say he was previously convicted of similar charges.
The sheriff says 22-year-old Robert Ray Johnson told a 16-year-old boy he was a rock singer, then asked the boy to send him nude photos.
Investigators say they've heard from other local teens as well who say Johnson friended them on Facebook.
Johnson is already a registered sex offender. He was released from prison earlier this year after serving time for child porn charges.
He is currently in jail.