With his new family, he began a more settled life by working in the cattle business. He served briefly in 1883 as acting sheriff of Uvalde County, Texas. During this service he trailed two stagecoach robbery suspects, the brothers Tom and Jim Hannehan, to their ranch near Leakey in Real County, Texas. The Hannehans resisted, and Fisher shot and killed Tom. Jim then surrendered and was taken into custody along with the stolen loot from the robbery. For years after Fisher's death, Tom Hannehan's mother would travel to Fisher's grave on the anniversary of Tom Hannehan's death. She would build a fire on top of the grave and then dance around it. According to reporter Carey McWilliams, when asked about how many notches he had on his gun (how many people he had killed), he replied, "thirty-seven, not counting Mexicans."