The US remains the only country in the western world which imposes the death sentence on teenagers who are convicted of first-degree murder. Earlier this year Sean Sellers became the first American in 40 years to be executed for a crime committed when he was 16. He had spent 13 years on death row after Killing his parents and a store clerk.
In this special edition, Edward Stourton looks into a case that has attracted enormous interest, not only because of Sellers's age, but also because medical evidence suggests he was suffering from a rare mental illness known as multiple-person disorder, in which alter personalities control the host's actions. The programme follows Sellers's last fortnight, featuring his last television interview and a clemency hearing in which he has 20 minutes to beg for his life. Stourton also talks to members of victims' families who watched Sellers's execution.
(Subtitled)