There is also information about this case in In Spite of Innocence: Erroneous Convictions in Capital Cases by Michael L. Radelet, Hugo Adam Bedau, Constance E. Putnam (Boston: Northeastern University Press, 1994, ©1992), page 72-73.

It also contains the interesting statement:

"One of the many curiosities of the death penalty is that although there seems considerable doubt whether it deters would-be criminals, there is little doubt that fear of the harsher penalty often deters even the innocent from pleading not guilty."