What is the solution to the book Who Killed Jock Ewing?

In the TV show "Dallas," the mystery of who killed Jock Ewing is solved in the final episode of the 1980 season. The culprit is Kristin Shepard, who is J.R. Ewing's scheming ex-lover and Sue Ellen's sister. Kristin shoots Jock Ewing but his death is ultimately ruled as an accident due to her claiming self-defense.