CASTRO VALLEY, Calif. -- The Alameda County Sheriff's Department announced a new lead in the case of a still-unidentified woman found dead three years ago in the back of a Carrow's restaurant.

They said they have a credible lead that the woman may be from Guadalajara, Mexico. Investigators told NBC11 News there is a missing woman from Guadalajara who matches her description. They did not have a picture of the missing woman, but they are asking for the public's help in the case.

Investigators also told NBC11 they have new DNA test results that lead them to believe Jane Doe was from Mexico.

The sheriff's department also announced today that the reward in the case has been increased to $65,000. They said an anonymos business owner recently donated $10,000.

The Alameda County Sheriff's Department held a memorial service Thursday in honor of Jane Doe. They've held similar memorials for the past three years.

Monday marked three years since her body was discovered.

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SLIDESHOW: Jane Doe Sculpture
SLIDESHOW: Jane Doe Pictures, Evidence

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Despite national attention, Alameda County sheriff's investigators have not found the killer of the victim they call Jane Doe.

Her badly decomposed body was found in a canvas bag behind a Carrow's restaurant on May 1, 2003.

Deputies have published drawings of her face and clothing and even had a sculpture made but still have no solid leads.