Alex Jones, born Annie, was a hunter in a future envisioned by God if the Winchesters succeeded in locking him away.
History
After the Winchesters locked God away, Jody continued hunting with Claire and the rest of her family. However, while on a routine vampire hunt, Jody and Claire encountered a larger than expected nest, leading to Claire's death. As monsters began running rampant, Jody also lost Donna, Alex and Patience, leading her to become suicidal and one of the few friends of the Winchesters still hunting alongside Bobby Singer.
This timeline and version of Alex was erased from existence after Sam chose not to trap God based on what he saw.