WI: Leopold II assassinated in 1902

On November 15, 1902, an Italian anarchist named Gennaro Rubino tried to assassinate King Leopold II of Belgium. Though he almost killed the king's Grand Marshall, Count Charles John d'Oultremont, Leopold was uninjured.

What if Rubino had killed the king? Could it have ended the atrocities of the Congo Free State six years early?
 
Rubino would had been executed instead sent to prison end of his life.

Probably Congo Free State would become Belgian colony earlier.
 
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