Read this excellent Letter to the Editor, recently published in the Vail Daily, on the exoneration of a man who spent more than 30 years in prison facing the death penalty for a crime he did not commit.  George Mizner of Vail does an excellent job of laying out the many reasons that Colorado’s broken death penalty is part of an unjust system that does not deter crime and routinely executes innocent people:
http://www.vaildaily.com/opinion/12900699-113/death-penalty-murder-percent?utm_source=swift_rss&utm_section=Opinion

To read more about the recent exonerations of  Henry Lee McCollum and Leon Brown, read Getting it Wrong on the Death Penalty for 30 Years from the National ACLU Blog of Rights:
https://www.aclu.org/blog/capital-punishment-racial-justice/getting-it-dead-wrong-30-years