Sen. Dianne Feinstein, a trailblazer for women in politics in California and Washington who spent more than 30 years in the U.S. Senate, has died. She was 90.

Known for working across the aisle while championing progressive causes, Feinstein planned to retire at the end of her term after facing concerns about her health and calls to resign. The oldest current member of the Senate, she died at her home in Washington, D.C. on Thursday night, according to a statement from her office.