Yes, he died in California. BUT, based on his movements and family, I doubt if you'll find an obit there. He may have been visiting, passing through, or ?
Dorrance is buried in Iowa:http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=ma...
--His wife Wilma died May 23, 1962.
I'd contact the cemetery to see what documenation they have. Sometimes they have records. If they have the name of the funeral company(s) handling the service, contact them. They might have a transfer permit, burial permit, etc.
Dorrance was born in IA, received his SSN in Utah in 1962(Based on his family [below], he was probably in Utah staying with his daughter). He took his wife, Wilma, to Europe in 1948. His daughter, Eleanor, born about 1923/1924.
The 1940 Census of Council Bluffs, Pottawattamie County, IA
Dorrance W Mann, age 43 (1896/1897), born in IA. He was a mail carrier/Government. Living at 373 Lincoln, was living there in 1935.
Wilma F, wife, age 41, Bookkeeper/Hotel
Eleanor, age 16(1923/1924).
--November 2, 1948:
Daughter -- Mr. and Mrs. Dorrance Mann, 373 Lincoln Ave received word Friday of the birth of a daughter to their son-in-law and daughter, Dr. and Mrs Paul Starley at Dragerton, UT. Mrs. Starly is the former Eleanor Mann of Council Bluffs.
--There is a wedding announcement in the Aug 4, 1946 issue of the Council Bluffs Nonpareil (Council Bluffs, IA):
Mr. and Mrs. Dorrance W. Mann ..marriage to Lt (j.g) Sidney Paul Starley, medical corps of the US Navy, son of Mr. and Mrs. Rulon F. Starley of Ogden UT. Marriage to take place ...on her birthday, Aug 9.
--May 26, 1949. Mr. and Mrs. Dorrance Mann visitors from the west... Mrs. Paul Starley and daughter, Trude, from Dragerton, Utah.
--April 8, 1954. Mrs Paul Starley and children, Trude Ann, 5, and Gregory, five-month-old will arrive from their home at Salt Lake City to visit...her parents.
--The Ogden Standard Examiner. Nov 2, 1969. Miss Trude Starley will become the bride of Richard Bott on Dec 27. Trude is the daughter of Mrs. William Nielsen of Salt Lake City and Dr. Paul Starley of Palo Verdes, CA.
--Salt Lake Tribune, Feb 8, 1976. Camille Anderson to wed Gregory Paul Starley, son of Mrs William R. Nielsen, Salt Lake City and Dr. S. Paul Starley, Los Angeles.
In 1993, Eleanor M. Nielsen living at 1754 Oakridge Dr, Salt Lake City, born 9 Aug 1923. Also there were Laura E. Starley, Dec 1954, (Laura S. McDowell), Steven D. McDowell, 4 Jan 1948.
--Eleanor M. Nielsen, born 9 Aug 1923, died 7 Nov 1989
--Gregory Paul Starley, born Oct 1953 was in Anchorage, AK in early 1990's, then in Dallas, TX in 1995. www.zabasearch.com
shows his address. He is the grandson of Dorrance Mann.
--I find a Trude Bott in Salt Lake City, also is a Rich Bott. Another database shows Richard A. Bott and Trude Bott (also with Timothy and Joann) in Kaysville and Park City UT; Plano, TX, and three PA addresses.
Dorrance in WWI National Guard:http://iagenweb.org/greatwar/ag/CoL_Pottawattamie.htm
Dorrance is listed here in a WWII military roster, perhaps your Father-in-law is also listed:http://www.ebooksread.com/authors-eng/harold-stanley-johnson...