Robert Dickerman of Costa Mesa, CA, charged in mother's death 25 (UPI) -- A Costa Mesa, Calif., man has been charged with elder abuse in the death of his mother, who he allegedly kept tied to a bed and a portable toilet, police said. Robert Dickerman, 47, was arrested Tuesday. He also faces charges of involuntary manslaughter in connection with the 2012 death of his 80-year-old mother, the Los Angeles Times reported Wednesday. In July 2012, detectives found Yoshiko Dickerman lying in a pool of urine in a bathroom in her home, suffering from dehydration and open sores. She was taken to Orange Coast Memorial Hospital, where she died a day later of sepsis, or whole-body inflammation. Robert Dickerman said he was unemployed and had been caring for his mother since 2001. He told police he couldn't keep the house clean because he was preoccupied with tending to his mother's needs. Police were first called to the home in response to a medical aide report of a combative elderly female. Robert Dickerman told police his mother became combative after she slipped and he tried to help her up. He said he left her on the bathroom floor for two days. Police later found he would restrain her to a bed and a portable toilet. Robert Dickerman is being held on $1 million bail at Orange County Jail and was scheduled to appear in court Tuesday, the newspaper said.