From a New York Times story by Annie Karni headlined “Senator Dianne Feinstein to Retire at the End of Her Term”:

Senator Dianne Feinstein, Democrat of California, announced on Tuesday that she would not seek re-election in 2024 but would finish out her term in Congress, making official a retirement that was long assumed by her colleagues, who had grown concerned about her memory issues.

The move clears the way for what is expected to be a costly and competitive race for the seat she has held for three decades.