Al Templeton

 convinces his good friend Jake Epping to go back in time to stop the assassination of President John F. Kennedy.

Biography
Al Templeton is a restaurant owner in Lisbon, Maine, the proprietor of Al's Diner. He has been in business for thirty-five years. Al fought in Vietnam and lost friends in the war. He has been close friends with Jake Epping for ten to twelve years.

Al discovers a time portal in the pantry of his diner which can transport someone to 11:58 AM on October 21, 1960. He calls this time portal, the "Rabbit Hole".

At first he uses the Rabbit Hole to go back in time to buy beef inexpensively. He then returns to 2016, turns it into "Al's Fatburgers", and sells them at a discount.

One day at the diner, while Jake is with Christy Epping signing their divorce papers, Al goes into the Rabbit Hole and spends two years in the past (1960-1962). When he returns, only two minutes have lapsed in 2016. He is haggard and sick with cancer. He passes out on the floor.

After Jake takes him to the hospital, they return to Al's house where Al shows Jake his extensive research on the Kennedy assassination. He wants Jake to go back in time to prevent the assassination and he has all the materials to equip Jake for the mission. He tells Jake to think about it.

The next day Jake returns to Al's house. He ultimately refuses Al's request because of his concerns about tampering with the past. Al gets angry and throws Jake out of the house.

The next morning Jake finds Al dead in his home. Al committed suicide to motivate Jake to pursue the mission. ("The Rabbit Hole")