I'd say you've hit the jackpot!
Her mortuary records are online.
Towne , Helen L
Towne, Helen Le Rette
Halsted
06 /22 /1968
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Here's a link to her death certificate:
http://www.sfgenealogy.com/sfmrimages/012-05/CALI0002D_Halst...?
Helen LeRette Towne
Born 27 December 1913
Died 22 June 1968
Age 54
no cause of death shown on this certificate
Informant: 1st Lt Geoffrey W. Towne -- son
Parents: Henry LeRette of IL, Estelle Wainwright of Morris, IL
Cremation was handled by Halstead & Co
Cemetery: Woodlawn Memorial Park (it is located in Colma, CA)
http://www.sfgenealogy.com/sfmrimages/012-05/CALI0002D_Halst...Newspaper notices - -hand dated "6-26-68" two copies -- may indicate publication in both SF Newspapers (Examiner & Chronicle) or morning and afternoon editions -- I think there were 2 editions in 1968, but may be mistaken.
Towne, Helen L. -- June 22, 1968
Helen L. Towne, loving mother of Rachael Towne, Cleveland, Ohio and 1st Lt. Geoffrey W. Towne, presently in the service in Viet Nam; a long time employee of the San Francisco Welfare Dept.
Services and Interment to be held in Morris, Illinoise.
Halsted & Co. 1123 Sutter St.
________________
other memoranda on this mortuary record page states:
Ashes sent to:
U.C. Davis & Sons
815-942-0084
Morris, IL
Friends of Gary Kahn
1st Lt.
son Geoffrey W. Towne
serving in Viet Nam
-- Home address 2030 Broadway #1