When you go to rescue him, he tells you about a plan to steal water from the 33rd, but once his plan goes wrong he purposely crashes the trucks. Martin Walker will take his .44 Magnum off the ground and the player has the option of either killing him or allowing him to burn to death when the wrecked truck's burning fuel engulfs him.
He wanted to destroy the water supply from the Aquatic Colosseum to kill off population in order to cover up the actions of John Konrad and the 33rd to avoid an unwinnable war with the Middle East and the United States.
Like Gould, he is one of the figures Walker sees in his hallucination after the helicopter crash taunting him as he tries to justify his actions. In the last chapter of the story, he is seen in the flashback accounting Walker's journey through Dubai.
- Since the Middle East has no blue-water navies and most powers depend on the West for logistical support, it is unclear how seriously Riggs' claims should be taken; some read them as indicative of paranoia and/or the same sort of delusional self-justification that Walker himself uses, possibly even more so than Walker himself.
- With the interpretation of him using delusional self-justification, Riggs could be seen as an older, but much darker foil to Walker. Both men have noble intentions (Walker wants to save the civilian survivors of Dubai while Riggs wants prevent a war between the United States and the Middle East), but they are both delusional about the validity of their goals and the methods they use only end up worsening the situation. However, Walker (at least, initially and also depending on the actions of the player) genuinely wants to help the refugees and at the end of the story, comes to realize (or also depending on interpretation, acknowledge) how his actions and behavior have worsened the situation, where Riggs shows absolutely no regard for the lives of the refugees and is willing to condemn everyone in Dubai to an agonizing death by dehydration in order to preserve peace between the US and the Middle East. With this, Riggs' insanity can be seen as a mirror to Walker's own mental and moral deterioration and can perhaps be interpreted as a warning for Walker and the player.
- He seems to be the oldest of all the members due to his graying facial hair. And in Chapter 10, after brutally killing a 33rd Soldier that surprises him, he will say he is 53 years old.
- It can be seen on Konrad's Psyche Profile, of which Riggs in the author, that it is sign "Francis Joy Riggs", possibly indicating that he is lying about his first name, or that it was changed late into development.