Hi Scott, there isn't any really easy way to remove a fillet, but it can be possible to remove it without grafting on an extra piece by breaking the surrounding surfaces into individual surfaces by selecting them and running Edit > Separate on them, then doing an "untrim" to remove the trimming boundaries and recover the original full underlying surface, then retrim those against each other.

It can be a fairly involved process. The basics of it are covered in this object repair tutorial:
http://moi3d.com/forum/index.php?webtag=MOI&msg=446.17

and there is information about how to do an "untrim" here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=444.4

- Michael