The infant overdosed on a fatal mix of Xanax, methadone and a painkiller on Sept. 28 2012, nearly five months after Stephens had been warned to stop breastfeeding because of high levels of methadone found in her son's bloodstream. The Sacramento Bee reports (http://bit.ly/1I6XsEs) that investigators initially thought Ryder overdosed on his mother's drug-laden milk, but forensic experts determined "it was scientifically unlikely" the fatal overdose came from mother's milk.