I am anti-death penalty for many reasons. Here's the main one -
From Amnesty International:
As long as the death penalty is maintained, the risk of executing the innocent can never be eliminated.
Since 1973, 122 prisoners have been released in the USA after evidence emerged of their innocence of the crimes for which they were sentenced to death. There were six such cases in 2004 and three up to December 2005. Some prisoners had come close to execution after spending many years under sentence of death. Recurring features in their cases include prosecutorial or police misconduct; the use of unreliable witness testimony, physical evidence, or confessions; and inadequate defense representation. Other US prisoners have gone to their deaths despite serious doubts over their guilt.