Jahns was the mayor who recruited Juliette and renewed her love with Marnes before dying from poison intended for him.
As mayor, Jahns carried out cleaning sentences without taking pleasure in them and sought a new sheriff after Holston's death. She and Marnes descended to Mechanical to interview Juliette, despite Bernard Holland's interference. The journey brought her into contact with Juliette's estranged father and deepened her conviction that the mechanic should be sheriff. She promised to legitimize necessary diverted supplies and arrange the power holiday that made Juliette's acceptance possible.
Jahns had spent decades alone after the death of her husband Donald. Traveling with Marnes renewed her emotionally, and the two kissed, slept in one another's arms, and held hands openly on dark stretches of the climb. She began to look forward to elections again and imagined Juliette might one day make a good mayor.
On the return journey, Jahns drank from the canteen Marnes carried and collapsed at the nursery. She told him she had loved him as long as she could remember and realized that the water contained poison intended for him. Her death became an investigation and was legally treated as manslaughter because she had not been the intended victim. Later records of Juliette's brief sheriff tenure reaffirm that Jahns recruited her despite objections to her qualifications.
Jahns is the deceased mayor whose recruitment of Juliette and death transformed the silo's leadership.
Also appears in books you've already read — spoiler-safe to their endings: