He was a very skilled bounty hunter proficient with guns and knives. Specifically John learned the skills with knife from him.
In the flashback of Desperados III, he together with his son John Cooper pursued Frank for the bounty. When he leaved his son under a tree to investigate further, John heard some gun shots and a group of gunman coming down from the way which his father went. John finds out that his father got captured by a long coat and being punched by Frank for several times. While John watching, Frank asks to James about did he come with an accompany, which James says that he came alone. Frank says one of his gunman called Eliot to deal with James, but Elliot is killed by a thrown knife by John. When Frank sees that young man he gives him 1 shot chance and pulls James to front of himself, also giving a Colt to John. Saddly John misses the chance to hit Frank, and hits to his father which causes his death. In Desperados III, John sought Frank to avenge his father's death.