Maggie:
It is also interesting in how that article was reprinted in newspapers across the country.
Do you have access to newspapers.com? I found subsequent article - "Planning a Lynching," Courier Democrat (Langdon, North Dakota), December 9, 1897, p. 10. It talks about Indian prisoners named Black Hawk and Defender that were arrested for the murder and rumors of a possible effort to lynch them.
https://www.newspapers.com/image/606571390/?terms=Thomas%20Spicer&match=1
There's another article - "The Crime Confessed: Murder of the Spicer Family Near Winona Cleared Up at Last," The Washburn Leader (Washburn, North Dakota), May 1, 1897, p. 1.
https://www.newspapers.com/image/466359255/?terms=Thomas%20Spicer&match=1
It seems to be a really interesting piece of frontier history, with reporting almost as interesting as the crime.
Roger
P.S. My wife's family has a story about a young girl murdered by a local boy enamored with her older sister and, in that, case, the local community committed an act of frontier justice. Your family seems better mannered that hers (grin).