Opponents of capital punishment claim that a prisoners isolation and uncertainty over his or her fate constitute a form of mental cruelty and that especially long-time death row inmates are liable to become mentally ill, if they are not already. This is referred to as the death row phenomenon. In extreme cases some inmates may attempt to commit suicide.
In the United States, prisoners may wait years before execution can be carried out due to the complex and time-consuming appeals procedures mandated in the jurisdiction. The time between sentencing and execution has increased relatively steadily between 1977 and 2010, including a 22% jump between 1989 and 1990 and a similar jump between 2008 and 2009. In 2010, a death row inmate waited an average of 178 months between sentencing and execution. Nearly a quarter of deaths on death row in the U.S. are due to natural causes. (source : wikipedia)
