How does Justice Blackmun say the death penalty must be carried out?

"From this day forward, I no longer shall tinker with the machinery of death," Justice Blackmun, the Court's 85-year-old senior member, wrote in an emotional, highly personal and solitary dissent from the Court's refusal to hear the appeal of a Texas inmate.

Explanation:

"After a 20-year struggle with the issue of capital punishment, he had concluded that 'the death penalty experiment has failed' and that it was time for the Court to abandon the 'delusion' that capital punishment could be consistent with the Constitution."