sounds like a fake question, but if it were to be true:
a landlord expecting what he is owed is not a jerk, it is not his fault bro failed to plan in case he couldn't pay rent.
when the accident happened (in the US), you could have requested the reasonable disability accommodation of being released from the lease without penalty. If that were allowed would depend on if the landlord was subject to FHA and if it would be a financial burden.
USUALLY, as long as you pay the next months rent, it would be a reasonable accommodation since he can no longer live there due to his disability. But its too late for that now.
your brother should be getting disability payments unless he is in the US illegally or didn't pay taxes....unless he is in a nursing home in which case he only gets $30/month with the rest going to the nursing home.
you can try for a no contact order if the contact is excessive, but if the court deems its not excessive you won't get the order.
its doubtful he is living in his own apartment now as he wouldn't be able to afford it on disability, if he's not in a nursing home, he would be living with family...and getting at least 791/month SSI/SSDI.
from that, he/his guardian should be able to set aside a small amount to put toward the debt.