Katherine, Kat to those who know her, went on a date with her boyfriend, Gavin. She thought he was going to take them to a movie, but they went to the abandoned Roosevelt Asylum instead.
She is possibly the Kat listed in the Hunter's Blog, although there is no way to confirm this. It has no content. The only one accessible is Jo Harvelle.
Co-Executive Producer John Shiban explains, that they didn't want to play the cliché with the character of Kat, thus making her the one to be feisty: "Let's not make her the one who's screaming, useless and helpless, let's make it the guy."Supernatural The Official Companion Season 1, p. 63