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Authorities have released a facial reconstruction of a woman's skeletal remains found on San Bruno Mountain in January in hopes of identifying her.

BRISBANE -- In an effort to identify a woman's bones found on San Bruno Mountain, authorities released photos of how she may have looked before her unexplained death.

The woman's name has remained a mystery since her remains were discovered Jan. 16 on a vacant hillside property southwest of Bayshore Boulevard and Old County Road despite DNA testing, authorities said. It's unclear how she died.

Her remains were discovered after witnesses spotted a man carrying her skull as he walked through a Brisbane neighborhood in November 2012. The man later led police to the spot where he says he found the bones. Police have declined to say whether they suspect he was involved in her death.

The woman was white, 33 to 46 years old, 5-feet-1-inch to 5-feet-9-inches tall and had an old injury to her left arm and pelvic area. It appears she was dead for at least five years before police found her bones.

This case doesn't match any open Brisbane investigations, and the city hasn't had a reported homicide in at least 10 years, police said.

Anyone with information about the woman can call Brisbane police Officer Guaydacan at 415-508-2188 ext. 541.

Contact Joshua Melvin at 650-348-4335. Follow him at Twitter.com/melvinreport.