San Diego police officials are investigating the death of a 9-year-old girl who died hours after undergoing dental surgery under anesthesia.

San Diego police are investigating after a 9-year-old girl died hours after she had undergone dental surgery, officials said. Silvanna Moreno was found unresponsive in her bed hours after being placed under anesthesia at a Vista dental office March 18, according to the San Diego Medical Examiner’s Office.

A 9-year-old girl died hours after going under anesthesia for a dental procedure at a San Diego office where a dentist was previously investigated after a patient nearly died.