Police say the teen and his sibling were nonverbal.
Before going missing, the child had been in DCFS custody after being diagnosed with a sexually transmitted disease.
An Oklahoma pediatrician is accused of murdering her 4-year-old daughter and staging the death as a drowning.
The child's mother was charged after she allegedly told detectives he died while she was trying to "exorcise demons out of her son's body," authorities said.
The temperature inside the vehicle was measured at more than 130 degrees, according to police.
A San Antonio mother was arrested and charged after allegedly buying ammunition and tactical gear for her son's planned "mass targeted violence" at his middle school, officials said.