[2016-05-03 12:00:00] In 1954, Dallas district attorney Henry

Wade convinced a jury to sentence Tommy Lee Walker to death for the

rape and murder of Venice Parker. A closer look at the details of

the crime, though, cast serious doubt as to whether Walker was the

real killer. This hour, we’ll talk about how racial prejudice and

the thirst for a conviction may have cost a man his life with Mary

Mapes, whose investigation

into the case appears in the current issue of D magazine.