Helpful information, though I think I have pretty much tracked him down. I now know that when he died on the night of September 8, 1909 the yearly southwestern soldiers association reunion just getting underway and large numbers of public officials were there. He was buried two days after he died, with no fanfare and very few in attendance. Ed Gray, a nephew by his younger sister was the only family present and the coroner. Ed apparently cleaned out his office in which were contained the collection of photographs now in the hands of the Huntington Digital Collection. However, we have also discovered a larger cache of his photos and have tracked down the fact that in 1853-55 he was a member of the Famous 2nd Grinnell Expedition to the Artic looking for the lost Franklin Expedition. He as twenty at the time and had just learned dugerotype photography. We have tracked down photographs of his taken in Murfreesboro and surrounding area. The Civil War Photography book dated 1911 shows a number of pictures taken of the Nashville and Chattanooga area along with other scenes. There is a picture stated as a military photographer who is leaning on his camera looking away from a railroad bridge just built. I am betting that is a photo of Bonsall. He was the only military photographer serving with the Engineers at that time.
Additionally, Bonsalls first wife died in 1883 and he remarried again to a Catholic woman in 1892. Being a quaker I would think have caused a problem with family. At any rate this marriage ended in divorce within a few years. Aftewards, Bonsall lived out of his office. He served public offices as the I. T. commissioner, the county commissioner. A probate Judge, city judge and city clerk. He is buried next to his first wife in an unmarked grave.