They don't know who killed a girl thought to have been between 12 and 17 years old, whose body was found in a bag by a detective. And they don't know who she was.
"If you had asked me May 1, 2003 if I knew who this person is, I would have said, 'No, but by tomorrow, we'll know who she is.' And here we are, over two years later, and we have no idea," says Sgt. Scott Dudek of the Alameda County Sheriff's Dept.
A police artist sketched her features, but because the body had decomposed, it was largely guesswork. Still, a drawing was released, in the hope someone would recognize her and come forward.
"At least point us in the right direction, give us a name, tell us who her mom and dad might be," Dudek says.
Still unidentified, the girl was buried as "Jane Doe."
Residents of Castro Valley adopted her, in death.
Dave Woolworth led the volunteer effort to pay for the tombstone and burial, and still visits the grave.
Why did he feel that he needed to do something?
"That's a question I still can't come to grips with," he sighed. "I don't know. This is the first Jane Doe I have ever heard of."
Police display the type of clothing she wore, again, hoping someone out there might recognize it.