I checked RootsWeb's version of the online Social Security Death Index :

http://ssdi.rootsweb.com/cgi-bin/ssdi.cgi?lastname=dewitt&am...

A woman named Helen DEWITT, with a similar birthdate (Jul. 30, 1912) to the one you posted, had a social security card issued in California. She died May 1984. Her last residence was in Port Townsend, WA---which is in Jefferson County.

This woman's birthplace and names of her parents would be on the SS-5 form she filled out when she applied for the card. If cost is no problem, you can buy a copy of that form from the U.S. government. RootsWeb has a form letter for this purpose.

Her parents names should also be on her death certificate, if the informant knew the information. If she died in Washington State, the record would be at the Dept. of Health, Center for Health Statistics, POB 9709, Olympia WA 98507.
http://www.doh.wa.gov

Typically, a death certificate has three facts which could lead to living persons : name of informant, name of funeral director, name of cemetery. Who paid the bill for these things? Who's buried next to the decedent? Did the funeral director place a death notice (obituary) in the local newspaper? Is there a will on file at the courthouse?

If you think this is the right person, and wish to learn about genealogical research in Jefferson County, you will be interested to know that Ancestry.com has a board devoted to that county, with 82 messages :

http://boards.ancestry.com/mbexec?htx=board&r=an&p=l...

Reading the messages on such a board is not only educational, but may permit you to hook up with an expert. This advice may also be of use to others who are reading messages here on the Hawaii board at Ancestry.com.

Reg Niles
RegNMINiles@cs.com