LaShirley Morris and Glenndria Morris were officially charged on Tuesday with two counts of murder, one of aggravated assault and two of first-degree cruelty related to the death of Kejuan Mason, 3, in Atlanta on 21 October last year.
The boy's guardian, Glenndria Morris, used her hand to spank him while the other sister allegedly used a bat to repeatedly beat the young boy in the head, stomach, legs and arms.
According to The Atlanta Journal-Constitution, Glenndria Morris told police that Kejuan had "choked" on the cupcake.
She told the officers that the cake was removed from his throat and he was "fine breathing and talking later", but she then found him "not breathing or responsive" when he went to take a nap.
According to her, she dialed 911 when she found the youngster, who was given an emergency medical aid.
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Kejuan was pronounced dead at Atlanta Medical Centre, with medical examiners concluding that he had died from blunt force trauma.
Glenndria Morris was arrested on the day of the incident, while her sister was arrested five days later.
The Fulton County District Attorney still had not formally charged them but both were granted a $200,000 bond on Monday.
The story originally appeared on SkyNews.
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