his father, darin hoover, said he was told yesterday of the isis leader's death. >> nothing's going to bring taylor back. we understand that. we get that. he set his legacy, and nothing's going to take that away. >> reporter: the u.s. is not releasing the name of the mastermind, and pentagon officials say the u.s. was not involved in the taliban operation that took him out. >> i don't care who it was that killed him. it's one less terrorist that we have to worry about. >> reporter: the august, 2021, suicide bombing happened near abbey gate during the final chaotic days during the u.s. drawdown from afghanistan. more than 100 afghan civilians were also killed. marine corps sergeant tyler roper sergeant tyler vargas-andrews survived. >> i'm thrown to the ground. i open my eyes to marines dead or unconscious around me. >> reporter: u.s. officials learned of the isis leader's death weeks ago, although not from the taliban. instead, officials made the decision from their own intelligence gathering. now a senior administration told cbs news that it type of thing might have ordinarily been ke