Duncan McCallum is a fictional character portrayed by Robert F. Lyons in the TV series Walker, Texas Ranger.
In the first episode they appeared in, titled Flashpoint (season 4), they were 56 years old.
They appear in 1 episodes out of a total of 196 aired
Episodes1
Flashpoint
episode S4.E13 january 1996An Irish peacemaker visits Texas to talk about a plan to unify Ireland. Irish militants attempt an assassination. One of the militants is captured and the rest of the team attempt a rescue as well as continue the assassination attempts.