In an unanimous opinion, justices say a lower court erred when it denied Catherine Wyman's request to obtain the out-of-state mental health records of her estranged daughter, Julie Bader-Dunn.
Dunn was the only witness to directly implicate Wyman in the death of 3-year-old James "J.W." Bader.
She told investigators Wyman routinely abused the developmentally disabled boy. She came forward in 2005 after the death of her father and multiple bouts with cancer.
Justices said Dunn acknowledged a history of suicide attempts and mental health problems, and that access to her health records could have affected the verdict.

