This is as bad as it gets.
A couple was charged today in the death of a 2-year-old boy in Racine. One of the suspects is the boy's mom. The criminal complaint released by police today details a pattern of severe abuse that led to the boy's death from strangulation. Here's the full criminal complaint, but be warned: It's horrible.
Also, please note the efforts of the police in this matter. It's a terrible thing to work a job that puts you close to the violent death - particularly of a child. The officers and investigators in this case deserve deep respect. They certainly have suffered through this case.