David Mason

David Edwin Mason (December 2, 1956 – August 24, 1993) was an American serial killer who was executed in San Quentin's gas chamber in 1993. This marked the second execution in the state of California since 1967, and the last execution by gas chamber in that state. Mason killed four elderly people in 1980, his cellmate in 1982, and is suspected of murdering his male lover.