That sounds like murder, not assassination.
Still sad.
Probably why the media “forgot” about it.
Consider this from Wikipedia:
“Alberta King was shot and killed on June 30, 1974, at age 69, by Marcus Wayne Chenault, a 23-year-old black man from Ohio who had adopted an extremist version of the theology of the Black Hebrew Israelites. Chenault’s mentor, Rev. Hananiah E. Israel of Cincinnati, castigated black civil rights activists and black church leaders as being evil and deceptive,... Chenault said that he shot King because “all Christians are my enemies,” and claimed that he had decided that black ministers were a menace to black people. He said his original target had been Martin Luther King, Sr., {but Alberta King was nearby]”. He had considered Jesse Jackson as a target previously. Chenault was convicted of first degree murder, and sentenced to the d.p., later resentenced to life. Fortunately he had a stroke and his life ended in 1995.
If the distinction of murder versus assassination rests on a personal v. ideological motive, this horrific crime was an assassination.