Unmasked: the doctor who helps put prisoners to death

Dr Mark Fowler assisted in the failed execution of a Tennessee prisoner. Physicians are meant to heal patients - why is he working in the death chamber?

Mark Fowler, a physician with 25 years' experience, stepped beneath the bright lights and approached the middle-aged man lying on a gurney. Around him, people in medical gowns prepared needles and sterile tubing.

It had all the appearances of a hospital setting.