Guillermo is a real person portrayed by Dominic Mariche in the TV series Billy the Kid (based on a true story).
They appear in 1 episodes out of a total of 15 aired so far
Episodes1
Fate
episode S1.E6 may 2022Billy bumps into Pat Garrett, who is riding with Jesse and the 7 Rivers Gang. Billy joins them - but law makers are already closing in. They plan to flee to Lincoln County - but not before Billy fulfils one last promise.