I came across this (prompted to dig a bit more on Stillman P.). Apparently he confessed to a murder on his deathbed in NE:
from Meet Mr. Swingle, Arnold High School Science Dept.
The Fullhart Murder
http://teachers.esu10.k12.ne.us/gswingle/stories/storyReader....... He (William H. Fullhart) also ran about 50 head of cattle and many horses, which were often out in the adjoining pasture belonging to William Groat. Mr. Fullhart and the Groat family had carried on a feud for years because Mr. Fullhart would let his animals roam and graze on the Groats land.
.....
Blame for the murder was directed toward Mr. Fullharts hired hand, William Oxley, a 32-year-old, handsome man who had suspiciously disappeared at the time of the murder. Oxley was apprehended in Springfield, Missouri where his family lived. He was returned to Broken Bow, Nebraska to stand trial. Mr. Oxley was known in Arnold, Nebraska as a kind, honest, trustworthy man with a very good reputation. Many people believed him to have been set up by the real murderer. Nevertheless, the trial came to an end in February of 1901 with William Oxley sentenced to 26 years in the state penitentiary.
Oxley always proclaimed his innocence and the fact that he was unjustly charged, tried, and convicted. It turned out that Oxley really was innocent; he served less than 2 years in the Nebraska State Prison at Lincoln, because the real murderer confessed to the murder on his deathbed. This mans name was Stillman P. Groat, the father of William Groat, and Mr. Fullharts neighbor Further information on Stillman Groat is sketchy, but some very real motives for the murder are the long-standing feud between the two neighbors, money, or possibly they got into a new argument.