Carroll was very close to George Washington. He was the minister Washington called for last rites. Given that last rites are a Catholic sacrament, that’s a very intriguing action.
You're right that Carroll was friends with Washington, but he was not called for last rites as far as I've ever heard. There is a very old story that circulates about Washington receiving last rites at the hands of a Jesuit priest, but that legend has never been confirmed. More details may be found here:
Did George Washington die a Catholic?