He didn't get the part because producers didn't think he could be taken seriously as a cold-blooded killer.
Cold-blooded animals, such as reptiles and batrachians, thrive best in an equable temperature, and, especially in the case of snakes, frequently can be induced to feed only when their temperature has been raised to a certain point.
They're violent, cold-blooded killers who are trying to stop the advance of freedom.
It is perhaps the worst crime, because the most cold-blooded and ungenerous, which can be laid to his charge.
These are effects of pedantry, and seem rather to be founded on a cold-blooded analysis of celebrated sermons than on any instinctive sense of the duty of the preacher.