And the search for answers continues. Who was Jennifer San Marco? And what caused her to kill?

Investigators are saying San Marco's long-held grudges, and mental imbalance created a lethal combination.

Santa Barbara County sheriff's detectives searched San Marco's home in Grants, New Mexico Thursday morning. They are looking for anything that might offer some insight into the mind of a killer. While most accounts describe a psychologically unstable woman, detectives are trying to determine why the victims were mostly women and minorities.

"Obviously there is an overwhelming number of female victims, we can't discount that, however, at this point there is no specific focus looking into racial or sexual motivation-- specifically looking into specific relationships between individual victims and the suspect, and the overall state of mind of the suspect," says Erik Raney of the Santa Barbara County Sheriff's Department.

San Marco moved to Santa Barbara from the East Coast more than a decade ago. Her first job was as a dispatcher for the Santa Barbara Police Department. A police lieutenant says she only worked for three months before leaving the department. He also mentions that it is not unusual for dispatchers to quit within a year, because it can be a stressful job.

She then worked part time as a food services employee at Santa Barbara High School, before eventually landing an entry level job at the Postal Service.

In 2003, San Marco sold her Goleta condo moved to New Mexico.