LOWELL -- A Level 2 sex offender from Dracut, who is on probation after pleading guilty last year to child rape, is being held on bail after he was charged with failing to register as a sex offender.

In Lowell District Court on Thursday, Mark Brunet, 25, pleaded not guilty to failure to register as a sex offender. Judge Michael Uhlarik ordered Brunet held on $500 and revoked his bail on a pending case.

Last year, Brunet was sentenced to three years probation with conditions that he register as a sex offender.

As part of his probation, Brunet must wear a GPS-monitoring bracelet, undergo sex-offender evaluation and treatment, undergo alcohol evaluation and treatment and abide by sex-offender laws in Massachusetts and New Hampshire.

In court last week, prosecutors allege Brunet failed to report that he is no longer living in Dracut. They said he is homeless.

In the underlying case, the 15-year-old victim's family told The Sun that during a 2008 incident, the victim was over at a friend's house. When the girl's friend left to take a shower, Brunet, the friend's brother, allegedly sexually assaulted her.