A convicted crack dealer who left prison early as part of the Obama administration’s mass release of federal inmates has been indicted by a grand jury for fatally stabbing his ex-girlfriend and her two kids in Columbus, Ohio. The gory crime drew national attention because the children, ages 7 and 10, were murdered to eliminate them as witnesses in the brutal massacre of their 32-year-old mother. This week a grand jury in Franklin County returned a 10-count, death-penalty indictment against the ex-con, 35-year-old Wendell Callahan, for the triple murders. Callahan broke into his ex-girlfriend’s apartment and stabbed the three victims,...