[Note: Since the death certificate we've found only uses the initials "J.W.", it is not clear if the certificate refers to John W. Nibel, or his brother Joseph Wilburt Nibel. More research is being done to prove whether this death was John W. or Joseph Wilburt Nibel.]

He passed away after his wife's death in 1924, perhaps in Mexico.
Joseph Wilburt Nibel was born ca 1865 as estimated from censuses but he claimed to have been born in 1871, so clearly there is a conflict in dates.
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1870 US Federal Census living in Washington, Lucas County, Iowa. (Nible) 4 years of age.

1880 US Federal Census living in Gowrie Twp., Webster County, Iowa. (Nibel) 15 years of age.

1885 Iowa State Census in Webster County, Iowa. Born in Lucas County, Iowa.

Resided in Mexico from 1893- Oct 1914.
Also lived in Sutherland Springs, TX.

1920 Passport for Joseph Wilbur Nibel shows birth date as 19 Mar 1871, born in Dayton, Lucas County, Iowa. Middle name is not written clearly. It could be Wilburt or Wilburn as well as Wilbur.

"San Antonio Light", Monday, Nov. 1, 1915, page six:
Mr. and Mrs. Joseph Nibel will leave Tuesday for Havana, Cuba. Mr. Nibel is the owner of mines and oil lands in Mexico.

another reference to J.W. Nibel in the
"San Antonio Light",
Thursday, March 27, 1919, page 8
WHTE STAR OIL COMPANY ORGANIZES; BECHTEL PRESIDENT
This Concern Has About 450 Acres of Leases in North Texas Fields.
...and J. W. Nibel, field manager, geologist and consulting engineer.
With the exception of Mr. Nibel, the other officials are well known locally. Mr. Nibel is a practical oil man and while his acquaintance with the public is not so extensive, among oil men is known very well..."