JACKSON, Miss. -- Authorities have announced an additional charge against the man who they say went on a deadly shooting rampage last week, killing six people that included his ex-wife and stepfather in a tiny rural community in northern Mississippi.Richard Dale Crum, 52, was jailed Friday hours after carrying out the shootings at multiple locations in Tate County, near the Tennessee state line. In a statement Monday night, Tate County Sheriff Brad Lance said that Richard Crum had been charged with one count of capital murder for the death of his ex-wife, Debra McNally Crum.Richard Crum had already been charged with one count of first-degree murder for the death of Chris Eugene Boyce, 59, a Florida resident who was shot and killed while sitting in a pickup truck outside a convenience store in Arkabutla.Besides Boyce and Crum’s ex-wife, authorities identified the others killed as Charles Manuel, 76; John Rorie, 59; George McCain, 73; and Lynda McCain, 78. As of Tuesday, Crum had not yet been charged in the shooting deaths of Manuel, Rorie and the McCains. George McCain was Crum's stepfather and Lynda was McCain's sister.