"I had never seen so many weapons in my career of 31 years," said LAPD Lt. Chris Ramirez.
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Police arrested Girard Damien Saenz, 56, on a charge of possessing, selling or manufacturing assault weapons, KCBS-TV reported.
>> See a photo of the suspect here
According to property records, Cynthia Beck owns the multimillion-dollar home located less than a mile away from the Playboy Mansion, the Times reported. Beck has three adult children with oil heir Gordon Getty, son of the late billionaire J. Paul Getty, the newspaper said.
"It remains unclear what, if any, connection she had to Wednesday's events," the Times added.
– The Associated Press contributed to this report.