William Henry Letterman (August 12, 1832 – May 23, 1881) was the co-founder of the Phi Kappa Psi fraternity in 1852 at Jefferson College in Canonsburg, Pennsylvania.

His system enabled thousands of wounded men to be recovered and treated during the American Civil War.

On January 17, 1868, Letterman received his Freemasons (Masons) apprentice degree from Concordia Lodge #13 in Baltimore, Maryland.

In the late fall of 1875, Letterman went to Prairie Home, Missouri, because of continued poor health and remained there for about three years.

He stopped at the Texas Hotel and the following day he hired a carriage and arrived at Duffau, Erath County, that afternoon.

In a covered wagon, with his brother Ritchie as driver and with his wife and two children riding nearby in a buggy, he set out from Duffau on May 15, 1881.

While the upstairs loft where Letterman spent his last days has held many merchants during the last century, it is currently a bar named Peckerheads.

At all events after careful advice, I leave tomorrow, closing the housing and go direct to the Gulf at the mouth of Rio Grande del Norte.

We go through Lampas, thence to Austin, then to the mouth of River, then we rest for 2 or 3 weeks rolling in salt water, then we make a bee line for San Antonio, Laredo, and return home if well.