He decided to go to jail by committing murder.
Out here in the real world, the elderly have their medical bills covered by insurance, federal programs, their savings or by family members ponying up the money.
This guy should not have frills like a motorized wheelchair - and yes, I realize that for many law-abiding non-murderers a motorized wheelchair is a baseline necessity, but those citizens deserve a higher standard to begin with and this inmate has hundreds of people standing around him with literally nothing better to do than to push him from point A to point B.
If he wants anything above inner city ER-level healthcare, he should ask his kids for help or do without.
This is a problem that’s only going to get worse due to the ever-expanding options for treatment and the corresponding costs thereof. If it was a simple problem, it wouldn’t really be a problem.