WLOS reported the child was taken to a pediatric intensive care unit last Saturday.
Clark was initially charged with child abuse to inflict great bodily harm, but his charges were upgraded after his son died on Tuesday, according to police.
The coroner’s office ruled that he was killed by blunt force trauma to his head. An autopsy was set for Thursday.
Authorities didn't immediately say what they believe motivated the attack. Clark was denied bond and remains in jail at the Greenville County Detention Center.
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