Looking into his middle name of Newton to see if he might be related some way to my Newton's (no) I found the following information.
John Newton Burgin
b. 12 Mar 1912 Groom, Carson, Texas
d. 20 April 1994 Fayette County, Texas (LaGrange area)
Married, (date unknown)
Lora Oretta Harred
b. 12 March 1912 in Hall County, Texas
d. 13 Jan 1987 in Sinton, San Patricio, Texas
Both 1930 and 1940 census place him and wife in Sinton, Texas.
Oliver Burgin (Burgen)
b. 1 Mar 1878 Lincoln, Potawattamie, Iowa
d. 3 May 1942 Camo county, Texas
Maggie Pearl Hodges
b. 26 Sept 1886 Montague, Montague, Texas
d. 1 Mar 1980 Canyon City, Randall County, Texas
Here is the link to a fairly complete tree I found (looks like perhaps yours?).http://trees.ancestry.com/tree/22169716/person/1196050102
I would look in Fayette County, Texas for an obit and grave of John as it looks like he moved there after his wife's death. Perhaps with one of his children? Looks like Oretta was buried in Sinton or the surrounding area. I would look in Corpus too.
I hope this is of some help.