The board refused parole for Jeffrey Franklin during a hearing Tuesday.
Franklin is now 36. He was 17 when parents Gerald and Cynthia Franklin were hacked to death with the hatchet inside their home. Three of Franklin's younger siblings also were attacked but survived.
|Franklin, 1998 immediately after killing his parents|
Authorities say they collected evidence that includes writings in which Franklin planned the slayings. A prosecutor has said the writings were sprinkled with themes of devil worship and sex.