A convict with a record of violent crimes against women was charged Tuesday with the 2007 slaying of a transgender prostitute, the first in what authorities described as a yearlong series of attacks targeting San Francisco’s transgender sex workers. Prosecutors said Donzell Francis, 41, of San Francisco, has pleaded not guilty to charges of murder, forcible oral copulation, sodomy by use of force and other charges in the death of 27-year-old Ruby Ordenana. She was raped, strangled and left naked near a freeway three years ago, police and prosecutors said. It was not immediately known whether he retained a lawyer.

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