Article continues below advertisementDonald Trump Jr. believes he was the first to tell President Donald Trump about Charlie Kirk's horrific death.While appearing on Scott Jennings' radio show on Thursday, September 11, the first son of the United States recalled the moment he learned the fellow right-wing political activist had been shot dead at the age of 31."I found out right before my father called me back on something," he told the CNN senior political commentator.Article continues below advertisementSource: MEGACharlie Kirk was a 31-year-old right-wing political activist.