What does Sal learn about Mrs cadavers husband?

Sal learns that Mrs. Cadaver's husband, who had been presumed dead, actually died in a tragic accident while trying to rescue a fellow soldier during the Vietnam War. This revelation provides insight into Mrs. Cadaver's character and adds depth to her backstory, illustrating her resilience and the impact of loss on her life. Sal's understanding of Mrs. Cadaver's situation deepens, fostering empathy towards her and highlighting themes of grief and remembrance in the narrative.