PIERRE (AP) - A woman accused in the death of her young daughter has testified in the trial of her former boyfriend, also charged in the case.

Twenty-four-year-old Zachariah Poor Bear is being tried on charges of first-degree murder and assault resulting in injury to a minor. Prosecutors say Poor Bear fatally beat 19-month-old Aaliyah Horse three years ago in Pine Ridge while she was in his care.

The child's mother, 19-year-old Tracey Horse, testified Wednesday she left the toddler in Poor Bear's care so she could go look for some marijuana. Horse says Poor Bear was mad that he had to watch the child.

The Rapid City Journal reports defense attorney Paul Winter told jurors nobody knows who inflicted the child's injuries, how, where or when. Horse was charged in juvenile court in her daughter's death.