Prior to becoming a vampire, he was a popular football player at his old high school, Wrenfield High, located a few miles from Mansbridge Academy. Karl's surviving relatives include his mother and a younger sister, Amy, whom he loves very much, to the point that he once stapled then classmate Malcolm Frye to a tree because of (false) reports Frye was trying to come on to her. When Karl finds an opportunity to reveal himself to his grieving sister a year after his "death", he changes his mind about doing so at the last moment and instead fools her into thinking that he is truly dead so that she can move on. His first two kills were his best friend and girlfriend (Carmen), draining the latter on the night of their school prom. An unknown vampire turned him on Halloween, and he joined the Man