A registered sex offender has been charged with the brutal sexual assault of a woman who was at his home to take care of him.

Police said William Johnson, 55, attacked his caregiver at his home on Murdock Road, off The Plaza, in north Charlotte.

According to the police search warrant, Johnson forced his caregiver into his home, tied her up and brutally sexually assaulted a woman. The warrant said Johnson then poured boiling water from a tea kettle over the victim's genitals.