Top Left is Deputy Sheriff W. G. Moore (Libby's Grandpa). He was killed on May 21, 1920.
Second row, second from right is Sheriff N.H. McGeachy.
The man in the center (Bottom) was killed by Carbine Williams.
Update: The "man in the center" is Alfred Jackson Pate. To read the full story, click here.
And to learn more about Carbine Williams, click here