Bail was denied Tuesday for Philip Markoff, believed to be the "Craigslist Killer" who killed an aspiring New York actress in a luxury hotel room. Markoff was placed under suicide watch on Thursday after police found what appeared to be shoelace marks on his neck.
The case has been followed by many in the Bay Area in part because Craigslist is based in San Francisco.
The body was found in the Nashua Street Jail.
In April 2009, Markoff pleaded not guilty to fatally shooting Julissa Brisman of New York and robbing a Las Vegas woman. Both occurred in Boston hotels.
He had been scheduled to stand trial next Spring.