|First appearance||The Kill Squad, Part 3|
|Date of death||2007|
|Home||North Hollywood, CA|
|Occupations||Kill Squad member, |
former Iraq War veteran
|Sibling||Karen Sprague (deceased)|
|Other relatives||Ted Sprague (brother-in-law, deceased)|
After four years of fighting in Iraq, Joseph Gallagher returned home to find his sister Karen dead. Sean Fallon recruits Joseph to the Company's secret military unit, the Kill Squad, with promises to explain what happened to his sister and brother-in-law. Joseph accompanies the rest of the kill squad, along with Lewis and Paulette Hawkins to Guyana. After the mission is completed, Fallon orders Joe to execute Paulette.
After Connie Logan and her team of Julien clones flee their base with Sabine and the root, Joseph and the other Kill Squad members are part of the Company's pursuit. Later, the squad fights the Julien clones after one squad member shoots Penny, Connie's daughter, dead. Another shot kills Connie, and they keep fighting the clones until all those in the vicinity are dead. Joseph and the other squad members then follow orders to do a full sweep of the area in order to report casualties.
Joseph lies dead in the woods, with Ricardo Silva and Anna standing over his body as well as the bodies of his dead Kill Squad comrades. Anna recounts their death - Ricardo had induced an uncontrollable rage in all the Kill Squad members, and then Joseph had started violently fighting with Lloyd, Sean, and Tom Drake. After Sean takes out his gun and shoots Lloyd, Joseph pulls out his gun and shoots Sean, killing him. Ricardo then smashes a large rock against Joseph's head, killing him.
In chapter 6 of Operation Splinter in the iStory, the Primatech and Pinehearst contractors spot Kill Squad members in wetsuits placing explosive packs on the water intake of the Rowland dam. Later, Red Eye spots and points out to the two contractors that the Kill Squad leaders, Lloyd, Sean, Thomas, and Joseph, are getting out of wetsuits and into the truck at the far end. In one possible ending, one of the Kill Squad leaders, after making it to the river bank, spots Red Eye so they crouch around a sniper rifle and take shots at Red Eye. One of them shoots Red Eye through the heart, killing him, while they take off in their truck.
- The above iStory character history depicts the most optimal events from the perspective of the iStory player. As per graphic novels Red Eye, Part 1 and Part 2, Red Eye doesn't die and instead gets captured by the Kill Squad along with Anna. For the cases where that occurs and the other possibilities/outcomes for the final chapter, see Operation Splinter/chapter 106 alternatives.
- Joseph joined the Kill Squad on the condition that Fallon tell him about what happened to his sister and brother-in-law. However, it is unclear if the circumstances of their deaths were ever revealed to him.
- For other uses of Joseph, see Joseph (disambig).
- For other uses of Gallagher, see Gallagher (disambig).