Santa Barbara, Calif. ? A woman wounded in a rampage by a former postal worker died Wednesday, and investigators said the assailant also killed a former neighbor just before the attack, bringing the death toll to eight.

A former plant worker said the attacker had made racist comments in the past, and at least six of the victims were minorities, but investigators have refused to discuss a motive in the slayings.

The eighth victim, Beverly Graham, 54, was found Tuesday, dead of a gunshot wound to the head, at a Santa Barbara condominium complex where former postal employee Jennifer Sanmarco lived up until a few years ago.

Sheriff’s Sgt. Erik Raney said authorities believed Graham’s death was “the beginning of this rampage.”

Sanmarco shot six postal employees to death and committed suicide in what was believed to be the nation’s deadliest workplace shooting by a woman.