All photos are reprinted courtesy of the author, with the exception of the following:
TITLE-PAGE PHOTO: © 2017 The Dallas Morning News, Inc./Tom Fox
Mark Twain Elementary class photo (1973), provided by Mike Shillingburg
South Oak Cliff High School, Oak Cliff, Texas
Courtesy of the Dallas Police Department
© 2017 The Dallas Morning News, Inc./David Leeson
© 2017 The Dallas Morning News, Inc./David Leeson
© 2017 The Dallas Morning News, Inc./Pat Davison
Courtesy of the Dallas Police Department