sentences:  Played by Craig Sheffer as a series regular for seasons one to three and as a special guest star in two episodes in season four and one episode in season nine, Keith Alan Scott was Dan Scott's older brother, and also a recurring love interest for Karen Roe, Lucas Scott's mother and Dan's ex.Keith was portrayed as Lucas's father figure, and was dearly loved by most characters in the show.He was a mechanic and spent a lot of time teaching Lucas about cars.