Marilyn Hartman, the woman known as the “serial stowaway,” was beaten up inside the Cook County Jail this week, sources said. Sources told CBS 2’s Brad Edwards that Hartman was assaulted on Tuesday. The offending inmate had some kind of episode – possibly a mental health issue, sources said. The inmate repeatedly struck Hartman and another inmate’s head against a number of hard surfaces. The Cook County Sheriff’s office Hartman and the other detainee were evaluated by Cermak Hospital medical staff and no injuries were found. Hartman was arrested for the eighth time this past fall for violating her probation.