@Draug … read the links when I post them. I typed out incarceration costs, not the full costs.
"It is sometimes suggested that abolishing capital punishment is unfair to the taxpayer, on the assumption that life imprisonment is more expensive than execution. If one takes into account all the relevant costs, however, just the reverse is true. "The death penalty is not now, nor has it ever been, a more economical alternative to life imprisonment.") A murder trial normally takes much longer when the death penalty is at issue than when it is not. Litigation costs – including the time of judges, prosecutors, public defenders, and court reporters, and the high costs of briefs – are mostly borne by the taxpayer. The extra costs of separate death row housing and additional security in court and elsewhere also add to the cost. A 1982 study showed that were the death penalty to be reintroduced in New York, the cost of the capital trial alone would be more than double the cost of a life term in prison. (N.Y. State Defenders Assn., "Capital Losses" 1982)"