This is a new one to me. I don't have anything on this death in autumn of 1863.
I looked in the 1860 census and found several Roland households near Jamestown in Linn Township, and 42-year-old R. H. Roland born VA is listed as a farmer and merchant. I wonder if he also had a mill.
I also looked without success for a Robert Thompson in the census of Cooper and Moniteau County. I did find two Robert Thompson Confederate soldiers who may have been this man, but their cards on record in the online Missouri State Archives did not identify their home or if they were killed during the war.
Some of Colonel Shelby's raiders went through Tipton 10 October 1863. I wonder if Robert Thompson was one of them who strayed from his command either to see Mom or whatever and some of the local members of either 43rd, 51st, or 52nd Enrolled Missouri Militia plugged him. Throughout Shelby's raid this October some members stopped in to see family they hadn't seen in one or two years. A few were stopped by the EMM in other counties along Shelby's route this way.
Do you have any other clues as to Robert Thompson's home or any other details of his death?