GOLETA, California (AP) -- A former neighbor of the woman who opened fire inside a mail processing center was found dead, a possible seventh victim of the woman's rampage, sheriff's officials said Wednesday.

"Evidence and circumstances of both crimes show distinct correlations between the two," said Jeff Klapakis with the Santa Barbara County sheriff's department.

The body was discovered Tuesday evening at a Santa Barbara condominium complex where former postal employee Jennifer Sanmarco once lived. The victim died from a gunshot wound to the head on Monday, Klapakis said.

Later that night Sanmarco fatally shot six postal employees before committing suicide in what is believed to be the deadliest workplace shooting by a woman. On Wednesday one of the victims who had been hospitalized in critical condition died, hospital officials said.

Sanmarco's former neighbor has been identified by her brother as Beverly Graham, 54.

Les Graham told The Associated Press that his sister had complained about a neighbor who "used to come out and rant and rave in front of her building." He said the family suspects that the neighbor and his sister's killer was Sanmarco.

Interviews with authorities in Goleta and with people in New Mexico, where Sanmarco moved in 2004, give a picture of a woman exhibiting increasingly bizarre behavior after losing her job.

"We weren't sure what she was going to do next," said Terri Gallegos, deputy clerk for the city of Milan, New Mexico, where Sanmarco applied for a business license in 2004 for a publication called "The Racist Press" that she said she planned to launch. Another time she said she wanted to register a cat food business.

During one meeting, Gallegos said, Sanmarco carried on a conversation with herself "like she was arguing with someone but there was no one there."

Last March, office workers called authorities after the 44-year-old woman made what Gallegos described as a rude allegation. Other times, Gallegos said, Sanmarco would come in and simply stare at one employee in particular.

In June, police in nearby Grants talked to her after someone at a gas station called to complain of nudity, Police Chief Marty Vigil said. Sanmarco was dressed when officers arrived.

Sanmarco left on medical leave
U.S. Postal Inspector Randy DeGasperin told reporters Tuesday that Sanmarco left the mail facility on a medical leave in 2003 after her co-workers expressed concerns she might hurt herself. He said police removed her from the building one time.

Authorities said it was unclear whether Sanmarco targeted specific employees when she arrived at the postal center about 9 p.m. Monday. But DeGasperin said "chances are" she knew the people she was shooting at.

"According to witnesses from the scene, she had a 9 mm pistol and reloaded at least once during her rampage," said Santa Barbara County Sheriff James Anderson.

Killed were Ze Fairchild, 37, and Maleka Higgins, 28, both of Santa Barbara; Nicola Grant, 42, and Guadalupe Swartz, 52, both of Lompoc; and Dexter Shannon, 57, of Oxnard. The wounded woman was identified as Charlotte Colton, 44, of Santa Barbara; she remained hospitalized early Wednesday in critical condition.

Higgins had just returned from maternity leave about a month ago and leaves behind a baby girl and her husband. "She was a talker. There was not a moment she was quiet," said colleague and friend Lexi Bushnell told the Santa Barbara News-Press. "She loved to lighten things up."

Swartz was emerging from a dark period after losing her husband, Donald, three years ago to cancer, according to friend Darlene Skura. "She was becoming more active, starting to get on with her life," Skura told the Los Angeles Times in Wednesday's editions.

Grant's neighbors said it was not uncommon to see the married mother of two shooting hoops with her children. "She was such a joy," said friend and neighbor Leslie Brown. "When you talked to her, she just glowed."

It was the first lethal shooting at a postal installation in nearly eight years and one of the deadliest since a string of high-profile cases in the 1980s and '90s -- including one in which a part-time letter carrier killed 14 people in Edmond, Oklahoma, before taking his own life.

James Alan Fox, a criminologist at Northeastern University and an expert on homicides, said he believed it might be the deadliest workplace shooting ever carried out by a woman.

Fox said his analysis of 450 workplace shootings over the past 30 years shows that only 7 percent were carried out by women.