Jack Andrews is a sports hero – quite an all-around athlete. We learn that he had played football previous to the first storyline, competes in ski jumping in the story we read, and is wanted for a college baseball team as the series ends.
Beyond that, we learn virtually nothing. There is a mysterious man who tried to bribe him when he was playing football. The guy sabotages the ski jump, and later tries to shoot him while he is competing. In the final instalment he encourages Jack to return to college, which Jack does.
So I’m guessing the guy was maybe hired by Jack’s parents who wanted their son to settle down and complete his education. And since Jack never appears again, it seems this is what happened.
Jack Andrews: New Fun 1 – 6 (Jan – Oct 35)