What started out as a chat on MySpace.com has led to the arrest of a Castle Hills man, police said.

According to investigators, Frances Rinaldini, 22, has been charged with the sexual assault of a Lee High School student.

Rinaldini was arrested at work Friday afternoon and charged with aggravated sexual assault of a child, an incident that happened earlier in the week, police said.

Detectives said two Lee High School girls met two men on MySpace.com, exchanged phone numbers and reportedly met up at a home in Castle Hills on Monday, during school hours.

Rinaldini's bond is set at $100,000.