According to police, officers responded to the intersection of Longmore and Southern over a report of an infant who was not breathing.
"Upon arrival, officers found the infant in respiratory distress. Mesa Fire and Medical personnel transported the baby to a nearby hospital, where, on the morning of July 29th, the infant sadly passed away," read a portion of the statement.
Investigators said medical staff noted the baby had visible bruising, as well as internal injuries.
"Through the course of the investigation, detectives determined that the injuries were inflicted by 19-year-old Arnold Barney during an incident in which he was reportedly unable to calm the crying infant," investigators wrote.
