Jack was the manager of Hap's Diner.
Jack was employed by the diner in the 1950s, under Hap's management. In February 1988, Sheriff Cable asked Jack about his co-worker Teresa Banks, who had been found murdered. Shortly thereafter, FBI agents Chester Desmond and Sam Stanley approached him with the same subject. He told them she would work a few nights a week and never saw her with anyone else. He suggested that they ask Irene.[1][2]