Allison allegedly had killed Jack Dunlop in a train robbery in Fairbank, Arizona.[3] He also seized two brothers who were outlaws.[3] Allison had retired as a lieutenant for the Arizona Rangers in 1904,[6] in which he settled in Texas.[3] With settling in Texas, he extinguished Pascal Morosco.[3] Allison specified as a "Special Texas Ranger", in 1917.[1] He worked along with inspector, Horace L. Roberson on an examination.[1] In 1923, they've both had to attend a grand jury for which they had both conferred evidence against their suspects, but it never happened.[1] They both had met their attorneys at the Gaines Hotel for which in a while their suspects Milt Good and Tom Ross had carried a shotgun and a pistol.[1] Allison and Roberson were both killed by their suspects, in which Allison's body was on the floor in April 1923 in Seminole, Texas.[1][3] Roberson's wife had heard the shooting.[1]