Aaron Duane Lucy gave his two-year-old son a fatal beating the day after Christmas, according to St. Louis police.
The child died last night in the hospital, about 24 hours after arriving there with severe injuries to his head, arms and legs. Police believe the boy was bludgeoned with a hard object.
Prior to his son's death yesterday, the 30-year-old Lucy was charged with first-degree assault and armed-criminal action. Those charges will likely include murder by the end of the week.
Lucy, of the 6900 block of Chippewa, remains in custody with his bail set at $250,000.