When and how did Hank's parents die?

Hank Mitchell's parents were killed in an auto accident the year after Hank married. Hank's wife Sarah believes that the wreck wasn't an accident but was Hank's father's way of escaping the enormous debts they'd accumulated. A week before the accident his father had brought Hank a load of furniture. Then he had given the old pickup to Hank's older brother Jacob.