NEW : Michael McLendon left behind letters describing ill will he harbored toward police . NEW : He was going to kill ` ` until he was stopped , '' investigator says . McLendon killed 10 people in two towns before killing himself . Watch the governor respond to the rampage » . McLendon unhappy with his efforts to become sheriff , police officer , police say .
NEW : Michael McLendon left behind letters describing ill will he harbored toward police . NEW : He was going to kill ` ` until he was stopped , '' investigator says . McLendon killed 10 people in two towns before killing himself . McLendon unhappy with his efforts to become sheriff , police officer , police say .