NASHVILLE, Tenn. -- A Nashville judge has appointed a lawyer to investigate what's going on with actress Reese Witherspoon's father who is accused of bigamy and possibly has dementia, according to documents released in a sealed court case.Earlier this month, Witherspoon's mother, Betty Witherspoon, said her husband of 42 years married another woman even though he remained wed to her.Read More... More on Reese Witherspoon