No cause of death has been disclosed for Dianne Feinstein, the longtime California senator who passed away on September 28, 2023, at the age of 90. Although concerns had been raised about her health and memory in recent years, neither her office nor her family has ever confirmed if she had any neurological condition. Doctors have noted that even if the senator’s apparent memory lapses were the result of dementia, the disease would almost certainly not have been her cause of death.