Well, I don't know if they were MAGA/Trump supporters but three white men who killed a Black man in Georgia were convicted and two of the three will spend the rest of their lives in jail and the third got 30-years (Arbery trial). The twelve-member jury that convicted them was all white except for one Black man.
Ok, that’s ONE possible instance of Trump supporters killing a black. That’s 1/300th or 1/400th of the black-on-black crime in Chicago alone in one year.