Alix Tichelman, a prostitute charged with involuntary manslaughter in the overdose death of a Google executive, pleaded guilty Tuesday. Forrest Hayes was found dead in 2013 in Santa Cruz, California, allegedly after Tichelman injected him with a fatal dose of heroin. She was sentenced to six years in prison, three of which she is expected to serve (she has already earned double time for serving 321 days).