Are you still looking for information about Jared Kirby/Alta Vista Plantation? I have found several newspaper articles using The Texas Portal website. For instance, in the Fort Griffin Echo (Fort Griffin, Tex.), Vol. 2, No. 25, Ed. 1 Saturday, June 26, 1880, there is a note "Col. Jared E. Kirby, formerly of Waller County, died in Colorado last week." If you need the link to the Texas Portal, I'll be glad to send that to you. The Portal also has articles about the Kirby murders.