Investigators said that someone in the home found King "lying on the toddler and called for help after finding them both to be unresponsive."
While King was administered opioid reversal drug naloxone, prosecutors said her 13-month-old son Jerimiah couldn't be revived and was pronounced dead at a nearby hospital.
King, according to the Courier-Post, told police that roughly two hours before the reported incident, she had ingested a prescription painkiller and had drank four "airplane bottles" of alcohol before leaving her house around 6:30 p.m.
She reportedly told investigators she took a cab to a nearby motel to hang with friends, and "the next thing she recalled was waking up and being told that she was just narcaned back to life."
King was charged with one count of endangering the welfare of a child, and is reportedly expected to appear in court Wednesday.