Troy Davis, 42, American convicted murderer, executed by lethal injection.

September 24 - Susan Atkins, 61, American murderer, brain cancer.

Lynn Turner, 42, American murderer, suicide by overdose of prescription medication.

Clarence Hill, 48, American convicted murderer, executed by lethal injection.

Martin Grossman, 45, American convicted murderer, execution by lethal injection.

Danny Rolling, 52, American convicted murderer, executed by lethal injection.

One of the most remarkable insights to emerge from the survey is how much these killers differ from the typical American murderer.

Teresa Lewis, 41, American convicted murderer, execution by lethal injection.

Robert Comer, 50, American convicted murderer, execution by lethal injection.

Christopher Newton, 37, American convicted murderer, execution by lethal injection.