The Mind Cage-A.E. van Vogt (SF PB, 1978)

DOOMED TO DIE ANOTHER MAN'S DEATH!

David Marin regained consciousness slowly.  Now he was all there.  But his hands seemed different, paler, thinner.  His flesh tingled.  The mental pictures crowding into his voice brain were strangely unfamiliar.  Even sounded foreign. But it was when he looked in the mirror that he understood real horror...

A man who had known the vision of an eagle now peered through glasses.  A man whose body had been a tireless machine now stooped with exhaustion.  Standing there was the body of Wade Trask, the brillant scientist whose daring experiments had made him and outcast.  David Marin no longer existed.

But her had a problem such as no man in the world had ever faced before.  His mind and nervous system were trapped in another man's body... a man who was condemned to die...