In December 2009, San Francisco police reexamined evidence from the October 21, 1979, murder of Mary Frances Bennett. Bennett, 23 years old at the time of her murder, had been jogging at Lands End, San Francisco, when she was attacked and stabbed to death. A DNA sample obtained from the evidence was matched to Carpenter through state Department of Justice files. In February 2010, San Francisco police confirmed the match with a recently obtained sample from Carpenter.