He could have an "accident" - prison justice.
If he is in solitary, poison in the food?
Would he still be a martyr?
If he "kills himself", would he be a martyr?
If he dies of a "heart attack" - martyr? At the very least, give him a picture of Helen Thomas and say the other virgins are not as pretty as Helen.
This piece of pig $h!t won’t just go away quietly. He’s going to complain every few months about not having some deathcult thing or other. First it’ll be that he is forced to obama while facing saudi arabia and demand they move the toilets. Then the food won’t be halal enough. Then the prayer rug needs vacuuming. Then he wants a deathcultist to trim his beard. Then his indoctrination book will be mishandled by guards. Then he will demand special treatment during the holy month of love and tolerance.
All the whining will be slavishly picked up and broadcast over and over by a deathcult loving media.