Garza spent his final hours a few steps away from the death chamber at Terre Haute, Indiana, reading and talking to his lawyers.

BBC: News Online

In a large heart attack, the area of cell death can cover the entire thickness of the chamber's wall.

BBC: Dr Robert Judd

The need for medical personnel to be inside the chamber rather than watching from outside merely to certify death follows rulings by a federal district court judge, Jeremy Fogel, that could have implications far beyond California.

ECONOMIST: Is lethal injection really so painless?