As the Aintree Grand National kicks off there will be one contender missing from the cards, Black Jack Ketchum. Unlike his outlaw cowboy namesake, Thomas “Black Jack” Ketchum, he does not meet his untimely demise by way of execution but through retirement from a career as a hurdler. The decision to retire this magnificent horse was made this week, as both trainer and owners feel that Black Jack Ketchum has tried to tell them that his heart is not in racing anymore.