Even though people are on death row , they do have a on say how their body is treated after death. First, to be an organ donor, an oxygenated blood supply has to be maintained throughout the body so the organs don't die prior to transplant. The body is most often kept alive artificially to achieve this. So killing then reviving a death row person doesn't follow on what makes sense. Secondly, various religions do not allow what is seen as "desecration of the body." The body has to be buried whole; intact.