According to the Montana State Genealogical Society's Death Index:
TURNER, Bert T.
Died: 05 Nov 1962 in Lake County
Montana Index #: 119
You should note that a Bert Turner is also listed in Ancestry.com's death index, but the info on Ancestry from the years 1954 through about 1965, are incorrect in everything except date of death. Incorrect information includes county of death and marital status, and age.
I subscribe to the "Newspaper Archives" database, but was unable to locate obits for either Mary Jane or Bert Turner, as this collection of newspapers is not complete.
You might want to try the Rootsweb Volunteer Obituary look-up service. Go to the following link where you will find one volunteer listed for Lake County who will look up obits in the Lake County Newspaper:http://freepages.genealogy.rootsweb.ancestry.com/~obit/volmt...
If you are unable to contact this volunteer, you could also phone the local library and ask if they keep copies of local newspapers on microfilm, and if they would be willing to look up these obituaries for you.
Polson City Library
2 Firt Avenue East
Polson, MT 59860-2333