Tucson, AZ. - Sheriff's deputies in Pima County say they've arrested a woman on child abuse charges after discovering she kept her 9-year-old grandson in a small closet and rarely let him out.

Deputy Dawn Hanke says the boy didn't attend school, can't read or write and weighed only 48 pounds.

The boy and his 8-year-old brother are in protective custody.

Hanke says 50-year-old Becky Lee Tortellet was arrested on a warrant Saturday. Deputies learned of the alleged abuse when she brought her older grandson to a behavior center and officials there became concerned after he told them he lived in his grandmother's closet.

The younger brother was normal and attended public school. Hanke says the closet was about 4-feet by 3-feet and had a foul odor of urine and feces.