Kate Milligan

In January 1990, John Winchester met Kate Milligan in Windom, Minnesota when he came into the hospital where she worked as a nurse when he was injured in a hunt. Their son, Adam Milligan, was born September 29, 1990 although he didn't have any contact with John until he was twelve. Thereafter, Kate and her son had sporadic contact with John who taught Adam pool and poker, took him to ball games on his birthday, bought him his first beer when he was 15 and taught him to drive the Impala. In 2009 Adam attended pre-med at the University of Wisconsin.

Kate and Adam are killed by ghouls as revenge for the killing of their parent by John Winchester during the time John and Kate met. One of the ghouls takes on Adam's form and memories in order to lure Sam and Dean to the town and later teams up with its sibling in the form of Kate to finish them off. Both ghouls are killed by Sam and Dean. Zachariah promised Adam that if he allowed Michael to possess him that he would ressurect his mother, Kate Milligan.