Anthony Graves, Troy Davis and Innocence

Anthony Graves spent 12 years on death row in Texas for a crime he didn't commit.

The story of Anthony Graves illustrates how a particularly heinous crime can lead to an emotional response and a tunnel-visioned investigation, and how the result can be that someone ends up on death row based on nothing more than flimsy physical evidence (later discredited) and dubious witness testimony (later recanted).

Anthony Graves, it turns out, was innocent, and was set free from Texas death row late last year.  CBS’ 48 Hours Mystery did a good job of telling the story this weekend, and you can watch it below.

Troy Davis, who was also sentenced to death despite a lack of physical evidence tying him to the crime, and who remains on death row in Georgia despite recantations from most of the witnesses who testified against him, has so far been unable to exonerate himself.