Adrianne Palicki is currently playing the part of Tyra on Friday Night Lights. As Tyra, Adrianne has proven that she has the chops to be a great actress with a lot of depth and intensity. Although Supernatural might be on the lighter side of things (let's be honest, it's not meant to be intense drama), it is safe to say that her casting will be a welcome addition to the show.
As things stand today, Adrianne Palicki is only slated for one episode early in the season. Hopefully we will see more of her.