Two-year-old Keanu Williams, who was beaten to death by his mother, had 37 separate injuries, including extensive bruising to his head, stomach, back and legs, when he died.
The toddler also had a fractured skull and a fist-sized tear on his stomach when he was found dead in January 2011.
The detective in charge of the investigation said it was the "worst" child abuse case she had ever seen.
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He was accused of making comments about women's clothing or bodies, with some alleged incidents taking place on camera.
Prison terms of less than a year do little to rehabilitate offenders.