Mother and boyfriend arrested in death of three-year-old son who was killed by blows to the head as injuries 'reveal he suffered years of abuse his mom covered up'

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A mother and her boyfriend have been arrested after her three-year-old son died from multiple skull fractures.

Tiffany Stotser, 27, from Kingman, Arizona, has been charged with child abuse after the youngster allegedly died in the care of partner Cory Williams, 26, who has been charged with manslaughter.

Williams was taken into custody on Thursday following a 911 call stating the child was unresponsive.

Tiffany Stotser, 27, from Kingman, Arizona, (left) has been charged with child abuse after the youngster allegedly died in the care of partner Cory Williams, 26, (right) who has been charged with manslaughter

Firefighters arrived at his address and airlifted the boy to University Medical Center in Las Vegas, but he died a short time later.

According to the Kingman Daily Miner, an autopsy revealed he had suffered multiple blunt force traumas to the head. 

Williams was arrested at his house a short time after his death and has been charged with manslaughter.

He is being held without bond.

The report also found the child had suffered injuries in the past, but they had been left untreated.

Stotser allegedly did not want the Arizona Department of Children Safety to be involved.

The pair are both in the Mohave County Jail. They could face additional charges.  

An autopsy found the child had suffered injuries in the past, but had been left untreated. Stotser (pictured) allegedly did not want the Arizona Department of Children Safety to be involved. It is not known if the child in the picture is the victim