Jim Jennison was J.B. Dix's half brother, they both shared the same father, and bore a striking resemblance to one another.
He hired out several people to try and track down J.B. and kill him while they were staying in the ville of Yuma, however they attacked Ryan alone and he defeated them. After his capture at the hands of J.B. and Ryan, he tries to persuade his brother into letting him go. In the end, after the others are killed, J.B. takes great pleasure in personally cutting Jim in half with the M-4000 scattergun. Before leaving he spat on his dead half brother. Jim stood at five foot eight, and was lean and pale, just like J.B. He squinted as if his eye sight was bad and he carried a HK P9S. (Shockscape)