SACRAMENTO—Justice Kathryn Mickle Werdegar, a 23-year veteran of the California Supreme Court, announced her retirement Wednesday. Her departure at the end of the term in August will give Gov. Jerry Brown a fourth appointment on the high court, creating a potential voting majority for years to come.

“I have had the privilege of serving with three outstanding Chief Justices and many wonderful colleagues, and the opportunity to address some of the state’s most challenging issues,” Werdegar, 80, said in a prepared statement. “But, it is time for someone else to have that privilege and opportunity. I wish my colleagues, the governor, and my successor well.”