Dick Blanchard, executive director for Advocates for Wrongfully Convicted, also confirmed the information.
The court voted 8-1 to reverse the 12th District Court of Appeals and remanded Jason Payne's case back to Wood County for a new trial.
Payne was convicted in the Dec. 11, 2007, shooting deaths of two family members.
He was convicted in 2010, and the 12th District Court of Appeals upheld it.
However, Payne's family and some crime experts contended that he was innocent of the killings of his wife, Nicole, and son, Austin. Some contended that the killings were a murder-suicide, carried out by the 16-year-old Austin.