Melvin Simpson, a brother, said that Durio had been sick since the end of the trial in October but that he did not believe that the stress of observing it was responsible for her death, the Sacramento Bee reported.
"Bottom line is, it isn't my brother's fault," Melvin Simpson said. "Her body just broke down."
Durio, 60, died Monday at Sutter Medical Center in Sacramento, Melvin Simpson said. She lived in Elk Grove, south of Sacramento.
Melvin Simpson described his sister as holding the family together during their brother's trial on charges that he killed his ex-wife, Nichole, and Ron Goldman and the trial last year in Nevada for robbing a sports memorabilia dealer at a Las Vegas hotel.
His sister, who lived for many years in San Francisco and worked as a dispatcher at a trucking company, moved to Elk Grove for some "flat land" after she developed arthritis and the hills became too much for her.