Saw a post here a few days ago about this, but it seems to have disappeared. There is an athlete up here in Canada who seems to have made it a habit to figure out ways to cheat in the ending marathon in several Ironman races! From what I have read, she has been DQ'd retroactively from the 2015 Ironman Canada, here is somebody's recap on evidence used to DQ her:
https://www.evernote.com/shard/s257/sh/f2807f22-45db-4db7-b656-0b3d4c04f70a/70ec36dda244f9a3
I believe I read in the post here a few days ago here that she has a twin sister and there was some speculation they might have tag teamed the marathon in 2013.