My father died this way 3 years ago, but he made the conscious decision to do so after discussing it with the family. He had PSP, a rare form of Parkinson's and had been sick for years. His body was rejecting the feeding tube and the doctors said that they could put him on IVs, but it would only prolong his death. It was a nightmare...I have never recovered from spending his last 10 days with him, watching him slowly starve to death, but it was his wish.
I feel for your loss of your father. The distinguishing characteristic in this case is that Terri doesn't have the ability to make the same choice as your father. It is an estranged husband with a monetary incentive who is trying to make the choice for her.