Just remembered one from American politics:
Madeline Albright. She'd been raised RC by a family of Jewish extraction (she didn't know about that) and then became Episcopalian.
Another: Charles M. Russell the "Cowboy Artist" was a member of and buried out of Church of the Incarnation, Great Falls, Montana. (my home town) Here is a bit from their site:
"The renowned Western artist, Charles M. Russell, was a member of the Church of the Incarnation. He did not participate in various church activities, but he did attend the early Communion service quite regularly, coming in late, sitting behind a pillar, and leaving early. He was buried from the Church of the Incarnation on October 27, 1926."