A Salt Lake mother pleaded not guilty Friday to charges she negligently caused the death of her 4-month-old son.

Dearwin "Dee" Boyd, 26, faces a trial Jan. 5 before 3rd Circuit Judge Paul Grant on a class A misdemeanor charge of negligent homicide.She is accused of being the last person to attend to her infant, Terry Dean Boyd, who was sleeping in a crib at a friend's house on Oct. 1. According to the charges, the friend discovered the baby unconscious and with a plastic bag over his head.