A man sentenced to death in the US state of California for murdering a 12-year-old girl and four other women has died of natural causes, officials say. Rodney Alcala, 77, died at a hospital near California's Corcoran state prison in the early hours of Saturday. Alcala, who was known as the "Dating Game Killer" after taking part in a US TV show, was convicted in 2010. As well as the California killings, he had also pleaded guilty to the murders of two other women in New York.