The death of a Maricopa infant in September has been ruled a homicide.

One-month-old Airick Amy died Sept. 28 from blunt head trauma and neglect and the manner of death was homicide, according to a Kern County Sheriff's Department coroner section news release.

The news release, sent Monday night, said the baby boy's cause of death was determined "after completing a thorough investigation including microscopic studies and toxicology studies."

Airick died at a house in the 10 block of Cover Street in Maricopa and deputies were called to the home. The baby reportedly had stopped breathing and the child's parents, mother Francine Williams and father Jessie Amy, were interviewed by investigators, sheriff's department spokesman Ray Pruitt said at the time.

The sheriff's department was investigating Airick's death in September but information about the status of the investigation was not available Monday night.

Amy, 34, was arrested Sept. 29 on unrelated child abuse charges stemming from a report Williams made on Sept. 26 that he had beaten and bruised her two daughters who lived with the couple. The two girls and the couple's 1-year-old child were taken into protective custody the same day, Pruitt said at the time.

Amy was charged with two felony counts of inflicting injury upon a child, according to Kern County Superior Court records. He pleaded no contest to one charge and the other was dismissed Oct. 17, court records show.

He was sentenced to three years in jail and is currently being held in the Lerdo Maximum-Medium Facility with an anticipated release date of Sept. 27, 2013, according to the sheriff's department's inmate website.