Emilio Juarez was abducted from Mexico and left orphaned.
Three years later, Derek cures Emilio's Post-Pempti and performs a liver transplant on him, as his liver was severely damaged during the operation. During the liver transplant, Emilio gets infected with Nous, but Derek is able to eradicate it.
Emilio dies after being infected by Kyriaki. He sacrifices his life for Heather, claiming he has GUILT antibodies that make him less prone to death. Derek's over-confidence in his Healing Touch also contributes to Emilio's death when Derek treats three others before Emilio, thinking the Healing Touch would let him save them all. Although all of his coworkers agree that he made the right call, his regret for Emilio's death leads to his collapse and the loss of the Healing Touch, thanks to his dependency on it.
- Although the game is not explicit about what kind of GUILT Emilio was harboring, many conclude that he was a Pempti Sinner based on the site of his PGS and the affected organ of the Sinners that Derek rescues.
- Emilio was afflicted with the most strains of GUILT and Neo-GUILT, having been infected with Pempti, Post-Pempti, Nous and Kyriaki.
- Emilio said that he could resist the Mutant Kyriaki infection because he has developed GUILT antibodies from his time as a Sinner. However, his failure to survive could be attributed to the fact that his antibodies are meant for an entirely different GUILT strain (Likely Pempti).
- In the Spanish version of UTK2, it is stated that Emilio is from Brazilian heritage.