Walter Longmire is a fictional character created by American author Craig Johnson (b. 1961) Longmire is title character of Walt Longmire Mysteries, a series of mystery novels first published in 2004. The novels were adapted into Longmire, a crime drama television series which premiered in 2012 and was developed by John Coveny and Hunt Baldwin. On the show, Longmire is portrayed by Australian actor Robert Taylor.