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This article is about a character appearing in the animated series, which is not canon. You may be looking for the live-action series counterpart, if any.
Susan Lyle was a character from Supernatural The Animation.
Susan's husband and son died in an accident. Some time after, she met John Winchester and helped him take care of his children. Susan grew exceptionally fond of Sam, due to the similarities between him and her late son, since they would have been about the same age.
Dean was reluctant to accept her, while Sam grew increasingly fond in return. John also found her presence a necessary comfort for his sons.
However, after a hunter attacked their home and tried to hurt Sam, Susan decided to kidnap Sam and take him to a scrapyard, where she expressed her wish to be with him forever. It is then revealed that Susan had made a deal with Azazel in exchange for the return of her family.
Dean pursued her and begs Sam to return to him, which Sam chose to. Susan was visibly hurt by this, but ultimately decided to rescue the boys at the cost of her own life, by attacking the contraption which was under demonic possession.