All the victims lived at an upscale facility in Calabasas, the Silverado Senior Living, which specializes in caring for Alzheimer's and other dementia patients.
Ulloa was arrested in October 2008, after an 11-month-long investigation by the Los Angeles County Sheriff's Department.
Authorities were alerted after a worker at the home made an anonymous call to the widow of Elmore Kittower, 80, who died in November 2007. The caller told her Kittower, a retired engineer, died as a result of abuse. The investigation revealed Kittower was abused for months before his death.
Ulloa, of Reseda, worked at Silverado Senior Living from February to November 2007.
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