Euthanized, yes. Denied food and water, no. We republished the Pinellas cruelty-to-animals statutes several times to make the point that Terri was treated worse than any other creature.
Last year, my neighbor's old Australian shepherd dog refused to eat and drink.
Instead of force-feeding his dog, he took the dog to the vet. The vet euthanized the dog. The vet speeded up the dying process.
If the vet had not euthanized it, the dog would have died just like Terri.
You forgot Peter Singer in your list of bioethicists.