No. I disagree. The brain activity is decisive whether a person is death or not. Your heart is not the place where you feel, despite all other rumors. It is widely accepted that people (more precisely: heads) who died on the Guillotine lived on for up to 1 minute (until the O2 was burned in your brain) and showed reactions. When you are shot in the heart, it is possible that you don´t get unconscious and live on until your brain runs out of O2. But Terri still has brain activity, so stopping to feed her would be murder.
The brain activity is decisive whether a person is death or not.
Where did you get that idea? The whole notion of "brain death" is historically unique. It did not come about until the late 1960s or 1970s. And there is no single definition of brain death.