Dianne Feinstein dead: Longtime California senator was 90

California Senator Dianne Feinstein has died, sources tell Fox News. She was 90. 

The longtime senator had suffered from extensive health issues for more than a year, leading many to wonder about her fitness for office. As of Friday morning her cause of death was unclear. 

Feinstein was present in the Senate on Wednesday and cast a vote at 11:45 a.m. ET, according to the congressional record. 

However, she missed two votes later in the afternoon.