1.86. A man is found dead in his parked car. Tire tracks lead up to the car and away. (SD; from How Come?)
1.86 answer: The dead man was the driver in a hit-and-run accident which paralyzed its victim. The victim did manage to get the license plate number of the car; now in a wheelchair, he eventually tracked down the driver and shot and killed him.
1.86a. Variant wording: It is winter in the city, and snow lies everywhere. Two sets of tire tracks lead into a garage. Only one set leads out again. A man lies dead inside. (RW)
1.86a answer: Same. (There are variant motives for the killing, but all involve the dead man being responsible for the wheelchair-bound killer's condition. For instance, the dead man could be a surgeon who made a mistake doing spinal surgery.