McCready, who had long battled addictions to drugs and alcohol, shot herself to death Sunday, just weeks after her live-in partner was found dead of a gunshot wound in their Heber Springs home.
While authorities immediately classified the faded country music star's death at age 37 a suicide, they have said Wilson's death remains under investigation and the cause as-yet-undetermined.
McCready had denied any involvement in Wilson's dying before she took her own life.
Cleburne County Sheriff Marty Moss told TMZ Tuesday McCready was never considered a suspect and was consistent in her accounts of what happened the day Wilson died.
"Mindy never changed her story," Ross told the celebrity news website.