Sadly it has happened in the US. Remember the gal in Florida?
The state allowed the Ex Husband who was screwing around on her and may well have been responsible for her condition in the first place to kill her in the same way.
Just like in this case, she was killed intentionally. If you remember, her parents were willing to take full custody and financial responsibility and wanted to move her to another facility.
There was also a girl in DFW ten years or so back that had a bowel disorder and the parents wanted to take her somewhere else for an experimental treatment but the hospital refused, and successfully sued to force the parents to leave her there and let them remove her lower bowel leaving her permanently attached to a colostomy bag for life.
Fortunately it’s rate but it’s happened more and more since the 70’s especially in cases where the parents object to a given treatment on religious grounds.