An Ohio judge has ruled that an 11-year-old girl charged with murder in the fatal beating of an infant in February is not competent to stand trial.

Lake County Juvenile Court Judge Karen Lawson made the determination Thursday. She says the girl has significant mental health issues that make her incapable of understanding court proceedings.

The girl will be held at a juvenile detention center for 90 days after which the murder charge will be dismissed.

Lake County Prosecutor Charles Coulson says he's disappointed in the decision.

The girl has been held in a juvenile detention center since Feb. 6, the day 2-month-old Zuri Whitehead died in surgery. Police say the baby was severely beaten while staying at a Wickliffe home with the girl and her mother.