Dale Earnhardt Jr. is reflecting on his relationship with Kyle Busch in the wake of the NASCAR champion’s sudden death.

Kyle Busch, a two-time Nascar Cup Series champion and one of the greatest drivers of his generation, died on Thursday at the age of 41, according to a statement from the racing series.

Joe Gibbs Racing honored the team’s former driver Thursday by calling Busch a “fierce competitor, an incredible teammate, and, far more importantly, a devoted husband, father, and son. His impact on o...