Gary Mack dies; called attention to JFK acoustic evidence

Gary Mack, curator of The Sixth Floor Museum in Dallas, and a nationally known authority on the assassination of President John F. Kennedy, has died.

Mack made two important contributions to the JFK story.

Gary Mack, long-time curator at the Sixth Floor Museum. . (David Woo/The Dallas Morning News)

Along with Mary Ferrell, Mack was the first to call attent…