Anson S. Johnson
Born: 9 Feb 1811, USA
Died: 15 Dec 1865, Corry, Erie, PA
Buried: Pine Grove Cemetery, Corry, Erie, PA
which includes info about his wife & children
The Corry Area Historical Museum, https://sites.google.com/a/corryareahistoricalsociety.org/
might have additional info about his family. They also might have his newspaper death notice.
You won't find a death record because Pennsylvania wasn't using them that early.
Another source is info will be his probate records. Successful Searching!