I don't want the kid and his terrorist friends to have the satisfaction of his becoming a martyr to their cause.
Make them all martyrs. This will not be over until all jihadis are dead...ALL...exterminated.
Personally, I don't care what they do with the body as long as we don't have to support him, spend gobs of money on his care and trial, and listen to liberals whine about his treatment and wanting to know WHY he did it. Get whatever information we can get from him and then...summary execution.