Pioneering lesbian activist and civil rights giant Phyllis Lyon died Thursday, officials said. She was 95. Her cause of death wasn't immediately known.
Lyon, who was born in Tulsa, Oklahoma, later moved to San Francisco and co-founded one of the first lesbian organizations in the country — Daughters of Bilitis — in 1955.
She and another co-founder, Del Martin, also started The Ladder, a nationally distributed lesbian publication. Martin, who Lyon later married, died in 2008.