A Case for Assisted Suicide

Stephen Griffiths, pictured above, has attempted suicide in his prison cell. He is awaiting trial for the murder of three prostitutes. The trial will probably be a formality; he has not denied the charges, and was actually filmed on CCTV in the act of murdering the last of the women with a crossbow.
Suppose that, having been found guilty, he attempts suicide again. What should the response of the authorities be?
It is likely that they would, as usual, attempt to save his life. It is my contention that not only should they not do so, but that he should have the option of terminating his life at any time with the cooperation of the prison authorities. His life has effectively ended. Even if he were to be released from jail, his history would bar him from any normal existence. If he had a wasting, incurable disease, most modern liberals would argue that he should have  the right to die. I suggest that the option of spending the rest of his life, effectively, in a single room, with no hope of any future existence, is worse than that of our hypothetical disease sufferer. In the jargon of human rights, life imprisonment is a more 'cruel and unusual' form of punishment than a swift, painless execution. He, and others like him, should have the right to opt out of it.