Historic events in New Mormon History on 12/11
1866: Brigham Young Jr. writes in his diary that "a nigger" is found dead in Salt Lake City with this note pinned to his corpse: "Let this be a warning to all niggers that they meddle not with white women."
Source: See
The Mormon Hierarchy - Extensions of Power by D. Michael Quinn
To see the whole database in chronological order,
Click here. Note that I'm not done entering all the information. While most of these facts come from Quinn's book, I'm seeking the primary sources for each, but this will take a long time.