In the days before he stole a semiautomatic weapon and stormed into an Oregon shopping mall, killing two people in a shooting spree, Jacob Roberts quit his job, sold his belongings and began to seem "numb" to those closest to him.
Roberts' ex-girlfriend, Hannah Patricia Sansburn, 20, told ABC News today that the man who donned a hockey mask and opened fire on Christmas shoppers was typically happy and liked to joke around, but abruptly changed in the week before the shooting.
Roberts...
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