I guess it depends on what you define as dead. Terri's brain functioned much better than that of our son. He lived twenty six years like that, a happy kid bringing joy to us both. Yet, he never had the brain function of Terri at her worst, at least prior to the last day or so of her life. And we didn't try to snuff him.
Her brain was doing fine after the incident. Here she is some time afterwards and before Mikey had her brain operated upon.
Terri on the road to recovery before the second stage began.